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In what follows, algebra will designate not only algebras properly speaking, but also pre-algebras. This move will not cause any confusion. Practically all algebraic versions of the most important logics are lattices. A good part of the concepts and results of algebra can be extended. So, it is not difficult to extend to pre-algebras the concepts of homomorphism, of isomorphism, automorphism, Cartesian product, free algebras, etc.

To explain how all these things can be done, we treat the notion of free prealgebra. An isomorphism of A in B is a bijection between A and B such that 1. It is obvious that an isomorphism is also an homomorphism.

The homomorphism h of A in B can be extended to a function b h of the set of equivalence classes of A into the set of equivalence classes of B. By analogy with the case of algebras, we define the notion of subprealgebra of a prealgebra. Let an be the family of n objects that will act as the generators of the free prealgebra whose existence we shall prove. Such attribution is called an A-valuation. Two such constant terms are equivalent, by definition, if the corresponding values are equivalent in A.

That equivalences are equivalences valid in A. All formal languages of the common logics are free prealgebras or, in some cases, free prealgebras, as we shall see. On free algebras, see Birkhoff [12] , and Bourbaki [13]. The nature of logic involves topological and algebraic ideas. Though a large variety of logical notions are topological in nature related to the weak topology determined by the theories of closed sets , logic also presents an algebraic dimension the underlying language of most logics are free algebras, whose operations possess a profound logical signification, numerous logics are essentially lattices, etc.

If your interests are practical, and you only wish to manipulate the world, whether for your own profit or for that of mankind, you can, without learning much mathematics, achieve a great deal by building on the work of your predecessors. But a society which confined itself to such work would be, in a sense, parasitic on what had been already discovered.

Bertrand Russell [93], p. Detalhes podem ser obtidos nas seguintes obras, entre outras: [55], [76] e [87]. Quantum theory does this very successfully. Teorema 6. Constata-se isso, por exemplo, pelo seguinte Teorema 6. Para isso, necessita-se do axioma da escolha.

Alguns autores o denominam de Paradoxo de Banach-Tarski. Para detalhes sobre o teorema precedente, consulte-se [] e as obras neles citadas. Ce qui est simple est toujour faux. We discuss questions related to the concept of identity, the meaning of experience and aspects of space- time.

I In what follows, ZFC0 will denote the system of Zermelo-Fraenkel with a finite or infinitely denumerable set of Urelemente, formalized in the firstorder predicate calculus without identity. ZFC will be Zermelo-Fraenkel systematized in the first-order logic with identity. Under these conditions, it is not difficult to prove the following statements: Theorem 7. Theorem 7. Let T0 be a theory based on the first-order predicate calculus without identity, but with Urelemente, and T an extension of T0 by de addition of identity and its postulates.

Then, if T0 is consistent, so is T. Corollary 7. Similarly, when the set of Urelemente is a finite family of disjoint finite sets of indiscernible elements. Remark In the extant empirical sciences, therefore, such as physics, given a consistent formulation of a theory based on ZFC, there are no means to distinguish between identity and congruence a binary relation having the formal properties of identity: reflexivity, symmetry, transitivity and substitution.

This fact may be called the indetermination of identity and has to be taken into account in any systematic treatment of the sciences, QM in particular. This indetermination is a logical problem, but, from the ontological perspective, numerous ways are open to overcome this difficulty.

II The part of quantum mechanics constituted by the techniques to test its empirical consequences, involves probability, statistics, computing and the planning of experiment. In this case, the employment of classical mathematics and its techniques is essential and cannot be eliminated, at least today. QM is composed by two parts: the first, theoretical, which may be systematized the empirical content being preserved by the means of several alternative logics, and the second, involving experimentation, based on classical logic and mathematics.

If a non classical logic, L, is employed to systematize quantum mechanics, since its empirical part is classical, then a central task is to investigate the relations between L and classical logic. In principle, the theoretical part of QM may only be seen as a method to help us to get new experimental results. The black box view. The mathematical relations valid in QM, based on ZFC, are invariant under permutations of particles of the same species.

The preceding proposition remains true in QS if the particles, supposed to be identical, are only indiscernible. III One of the most surprising results in the mathematics of the threedimensional Euclidean space is the theorem of Banach-Tarski, also called paradox of Banach-Tarski. Among its possible formulations, there is the following: Theorem of Banach-Tarski.

The axiom of choice is utilized in the proof of the theorem. The above theorem shows how the underlying space-time of QM is an idealized structure. We have: Theorem 7. This is valid, of course, in connection with any relevant physical theory; however, in QM it obviously conveys a false image of the physical situation, which causes various theoretical difficulties. In QM this remark also applies; but in this discipline the state of affairs is more complex:.

QM has, in principle, various alternative interpretations, all of them being empirically equivalent. So, at least today, there are various quantum mechanics. One of the difficulties is the size of particles. If they behave like material points, there are some obstacles; otherwise, there are also problems of different nature. There are several analogous problems.

Conclusions 1. There exist various empirically equivalent, though theoretically distinct, formulations of quantum mechanics, even based on non classical logics. In certain sense, quantum mechanics is the collection of these incompatible formulations. Classical logic and mathematics are essential to the complete systematization of such mechanics, with reference to its empirical applications.

Maybe, the theoretical difficulties presented by quantum mechanics are, in general terms, a consequence of the fact that it is only a first approximation to a more sophisticate and more complete theoretical construction. Clearly, the central portions of its various formulations may be employed as bases for several alternative ontological developments. On the other hand, only a few experts did, in earnest, investigated such subject, deserving mention, among them, Stanley Jaki and Stephen Hawking.

We will not present here a rigorous and full treatment of the theme, but proceed informally, giving references for the reader, in the case that he is interested in an ample and rigorous treatment of the matter. Hawking [63] and Jaki [72] are very good expositive pieces, both elementary. All syntactic concepts to which we make reference in this paper are arithmetically definable, i.

Nonetheless, we are able to transform this subject in axiomatic theories and, at least in principle, into formalized pieces, that is, in a certain sense, into plays with symbols see [55], [73] and [76]. This can be done with Peano arithmetic, set theory and other mathematical theories, including those of physics supposed rigorously systematized. In other words: the theories of mathematics and physics are in principle reducible to symbolic games, that is formalizable.

Giving a formalized theory, the next possible step is to transform the initial theory in part of Peano arithmetic, that is, to arithmetize it: to transform the initial theory in a portion of arithmetic. So, it becomes an arithmetical theory, involving only natural numbers, properties of numbers and relations involving numbers.

This way, all significant and recursive aspects of arithmetic, from the syntactical level, are expressible in the language of first order Peano arithmetic. In technical words, that the class of formal theorems is recursively enumerable.

Incompleteness in physics Physics is an area of science in which the preceding general considerations may be applied. The Sixty Problem belonging to the list of Hilbert [67] is the following: To develop an axiomatic treatment for all physics. Clearly, such axiom system should be strong enough to contain at least first order Peano arithmetic; in addition, it should be consistent, i.

This means that under certain clear conditions, the consistency of a consistent physical or mathematical theory can not be proved inside this theory. Analogously, extended theories similar to a complete theory of the Standard Model and the Grand Unified Theory GUT , supposed consistent, are also impossible.

Moreover, even the consistency of those theories can not be proved inside themselves if they are consistent. But they remain true in the case of certain non-classical logics, if these logics are employed as the foundations of the corresponding physics. Thus, the metatheorems are valid in the cases of some intuitionist version of mathematics, as well as in formulations of some paraconsistent mathematics and their logics. An important point is that they are also applicable to various fields of technology.

It does not mean at all the end of physics. It means only the death knell on endeavours that aim at a final theory according to which the physical world is what it is and cannot be anything else. They can hit upon a theory which at the moment of its formulation would give an explanation of all known phenomena.

Regress to infinity is no answer to a question that keeps generating itself with each answer. Maybe, a kind of Sisyphus job. In the long run, science may change drastically. Reality is not a quality you can test with litmus paper. With recourse to logic they would also know what to think of efforts to derive the very specific constants of physics form nonspecific considerations.

Insofar as mathematics works with numbers it will remain steeped in specifics all of which raise the question: Why such and not something else? It is that question which keeps the mind awake, or rather is raised by minds not prone to slumber. In synthesis, the scientific endeavour constitutes an endless activity.

Complementary note There are other ways to find limitations in the extant, usual mathematics, as well as in the sciences in general confer with [43]. So, there is a major question to be dealt with here: why does it seem to us that all major mathematical questions can be settled by our main provability techniques?

There is no easy answer to that question, but we are slowly uncovering a wilderness of mathematical facts that stay out of the reach of our main mathematical tools. As if mathematics would remain inaccessible from itself. However, in , in his book [72], Jaki remarked that the same is true with reference to physics.

Talking about a meeting in which various very known physicists participate including him, he wrote in [73] that: After the speech [of Gell-Mann] it was first the turn of the other panelists to comment. When my turn came I reminded Gell-Mann that even if he had formulated such a final theory he could never be sure that it was really final. He shouted back rather angrily. I said. Our objective is to present some known metatheoretical results of particular interest for our principal aim: to discuss certain fundamental aspects of QM and to delineate some philosophical consequences of our discussion.

From the mathematical point of view QM constitutes the study of a kind of complex in particular real Hilbert space supposed to be separable. A hidden-variable theory is one in which the description of a quantum system by the means of states described by QM is not a complete description. New variables, beyond those of standard QM contribute to govern the quantum processes.

On the other hand, a satisfactory non- local hidden-variable theory was worked out by de Broglie, Bohm and others [96]. The various standard versions of QM see, for example, [59] and [96] are empirically equivalent. However, some topics can be treated more conveniently in one version than in another.

For instance, the following [9] : 1. If a hidden-variable theory is local, it will not agree with quantum mechanics, and if it agrees with quantum mechanics it will not be local. No physical theory of local hidden-variables can ever reproduce all predictions of quantum mechanics. In a non-local hidden-variables theory, there are signals that propagate instantaneously and the theory is not Lorentz invariant. But, on the other hand, we have: Theorem 9.

Usual quantum field theories, which are local, are not compatible with QM unless some ad hoc adaptations are made. Kochen-Specker theorem The theorem of Kochen-Specker is essentially connected with the one of Bell; it is the following [81], [85] and [? It is impossible to attribute values, simultaneously, to all quantum quantities of a quantum system, under the supposition that the relations existing among them, imposed by QM, remain valid.

The dimension of the corresponding Hilbert space has to be equal to or greater than 3. Among the suppositions behind the proof of the Kochen-Specker theorem, there is the following: The results observed in measurement are dependent upon what other measurements are being made; in other words, the result of a measurement of an observable is dependent on which other commutating observables are being measured.

Quantum contextuality means that the result of a measurement of a quantum observable is dependent of which other commuting observables are being regarded. We also have: Hidden variables are correlated with the system that is being measured and not with the process of measurement.

A non-contextual hidden-variable theory cannot predict the usual results of QM. In it there are no properties or relations in the usual meaning of the word we have to take into account the context. This way there exists in QM a logical difficulty: the properties and relations of a quantum system are context-dependent. Therefore we arrived at a problem: the logical laws of classical logic, in particular the principles of first-order predicate calculus, with or without equality, are not valid for the quantum systems.

However, classical logic is usually employed as a foundation for QM. How is this possible? Sometimes, only parts of classical logic or some informal modifications of parts of such logic are taken into account. But usually there are no detailed indications of how our problem could be solved by this kind of procedure. We insist on the fact that the Kochen-Specker theorem shows that the classical, metaphysical, identity is not valid in QM. Effectively, in order to be valid it would be necessary that each observable of a quantum system should have a well- defined value in any instant of time, what is false according to the theorem.

The theorem of Conway-Kochen The proposition to be taken into account in this section, also called the Free Will Theorem, is the following [16] : Theorem 9. Under certain conditions, satisfied by QM, if two physicists are free to make choices on what to be measured, then the. For us, the relevance of the preceding proposition is, above all, that it implies the fact that QM constitutes, essentially, an intrinsically probabilistic discipline: there is no simple deterministic extension of it.

Loosely speaking, a simple extension of a theory is another theory, stronger than the first formulated in the language of the initial theory: there are no new additional concepts. In connection with QM one has to be careful when it is employed in combination with other disciplines, specially deterministic ones such as, for instance, relativity.

The interconnections between macroscopic determinism and QM are delicate and difficult to be explained. Gleason theorem: Let H be an Hilbert space, real or complex, of dimension greater than or equal to 3, and u a measure on the closed subspaces of H. According to Pitowski, QM constitutes a kind of probability theory [90]. It is possible to decompose any vector of H according to infinite bases and all the identities that express such decompositions can not be simultaneously.

In consequence of that fact, we have: Theorem 9. Theorem 6. Theorem 9. Under these conditions, there are during I, mathematically true propositions referring to H which are not physically true of S. The central results of this paper constitute metatheoretical ones, that help us to make an idea of the meaning of the physical theories and, as a consequence, of physics.

We may say that the logical significance of physics is profoundly connected with its central metatheoretical results. Those presented above are related to the foundations of quantum mechanics. But more or less similar ones are appearing in all areas of physics for instance, the Kolmogorov-Arnold-Moser theorem in celestial mechanics [6].

Today the progress in the metatheoretical foundations of science in general is in a continuous state of development, such as the one of physics in particular. An informal digression In informal quantum mechanics there are some difficulties caused by informality.

If they are. However, this and other categories of procedures give rise to insurmountable difficulties form of the particles, their trajectories, their volumes, etc. So we have: Theorem 9. Informal QM is inconsistent. The preceding statement shows that certain amount of rigor is relevant, even if we are not trying to develop an entirely formal QM.

Kinds of physical theories At the beginning of this section we quote Manin [85], p. Creating and understanding these foundations turned out to have little to do with the epistemological abstractions that were of such importance to the twentieth-century critics of the foundations of mathematics: finiteness, consistency, constructibility , and in general, the Cartesian notion of intuitive clarity.

Instead, completely unforeseen principles moved into the spotlight: complememtarity, and a non classical, probabilistic truth function. The electron is infinite, capricious, and free, and does not at all share our love for algorithms. There are three kinds of physical theories: 1. Those which possess definite mathematical languages in which they can be formalized. For example, Euclidean geometry and classical point mechanics, both envisaged as natural sciences.

They have a strict axiomatic formulations, as well as informal meanings. Theories which, in certain acceptation, do not have a proper language using instead the language of a mathematical discipline conveniently interpreted. This happens with QM: its language is that of the theory of Hilbert spaces employed from the perspective of physics.

This situation is similar to that of quantum field theory as in the standard Model. In general, a physical theory has a place in between the preceding two cases such that it happens with hydrodynamics and heat theory. A physical theory in particular QM, must contain connections with experience This relationship is build with the help of probability, numerical analysis. We finish this part of our paper quoting again Manin [85], p. In other words, QM is nonlocal and nondeterministic.

So, QM is incompatible with strict field theories. In a few words, the effective logic of physics has to be paraconsistent, although locally classical see [38] and [85]. The result of Conway-Kochen clearly proves that determinism is out of the range of QM. In addition, by section 7 of this paper, we conclude that if we are not careful, we will arrive at contradictions. A certain amount of rigor appears as basic for QM; otherwise, we shall find enormous conceptual hindrances.

The previous discussion concerning a possible and general classification of physical theories indicated that ours does constitute a reasonable one. There exists, however, a certain agreement among all those theories:. This means in fact that the underlying, working logic of quantum theory is paraconsistent in a non local sense [38] and [44] , topic that we shall treat in a following paper.

A large portion of the present work can be adapted to the case of quantum field theory, as we shall explain in the future. A e de Ronde, C. Como se pode explicar tudo isso? Notas 1. Our main objective is to insist on the relevance of cohomological methods for the treatment of such mechanics.

Our present work will be the starting point of a series of papers on a new mathematical foundation for quantum mechanics and its philosophy. Two kinds of quantum mechanics. There are two usual approaches to quantum mechanics: the non relativistic and the relativistic. The meaning of cohomology. Cohomology is a form of associating algebraic invariants to mathematical structures; for example, abelian groups to a topological space.

Cohomology is a kind of dual operation to homology. Both are methods of construction of invariants for mathematical structures that belong to algebra or topology more in general, of any kind of structures at all, when this is possible and convenient.

Here we shall outline how cohomology can be relevant in the domain of quantum theory. The Aharonov-Bohm effect. This effect is a quantum phenomenon in which an electrically charged particle is affected by an electromagnetic potential in spite of being confined to a region in which both the electric and the magnetic fields are null.

This fact is a consequence of the coupling of the electromagnetic potential with the complex phase of the charged particle. The effect under consideration can be detected by the means of interference experiments. An example occurs when the wave function of a charged particle, that pass near a solenoid, experiences a change of phase as a result of the action of the magnetic field inside the solenoid; all these things happen when the magnetic field is null in the region in which the particle moves, although its wave function is also almost null in the interior of the solenoid.

Leaving aside the common explanations for instance, that we can only measure absolute values of the wave function , with the help of cohomology methods plus some other mathematical tools, we are able to explain the effect see [46] and [2]. Our explanation of the effect makes appeal to cohomology with some more mathematics, as we already noted see [46]. But in future papers we will show that with topological methods and a little more mathematics, it is possible to develop a theory that unites all aspects of quantum mechanics, non- relativistic as well as relativistic.

In particular, we obtain an explanation of the Heisenberg complementarity relations, Aharonov-Bohm effect, superposition and entanglement see [45]. Note : In [46] and [45], we show that the existence of two fundamental objects of quantum mechanics QM is derived from the symmetry of spacetime: the existence of particles and that of fields. If we consider only Galileo group, we miss the central part of QM and are unable to understand the real meaning of this science.

Otherwise, we would consider that QM is in essence random, because the space-time correlation is left out, correlation which is responsible for its random aspect. Particles or waves are only two ways to look the reality from the space side or from the time side. When we face the situation from both sides, them the two collapse and we find the quantum objects properly speaking. Notes: 1 Null curvature does not imply that parallel transport is trivial in simple connected regions.

Ver [9]. Consultar [81] e [85]. Como se acreditava que fosse o caso. Como P. Lars Eriksen he philosopher interested in the foundations of today physics has, sooner or later, to deal with the problem of the nature of particles. When the physicist talks about particles, is he talking about individuals, real metaphysical substances? Or is he making reference, basically, to other entities or theoretical constructions, for example fields? They are conceptual tools to take into account, in a simple way, of some aspects of certain physical systems.

Loosely speaking, in classical physics, particularly in classical mechanics, a particle is always a small material body the degree of smallness being. In some cases, a particle can be identified with a moving point, its real dimensions presenting no relevance point, in this sense, can not be a geometrical point, since such points are necessarily fixed, etc. Classical particles are stable, have mass and occupy a definite position in any given moment of time.

Classical particles are connected with classical space-time. The letter separates the former in the sense that different particles can not possess the same space-time coordinates; if this happens, they are equal or identical. Particles are individuals, subjected to the laws of classical mechanics and to the norms of classical logic , specially those of Lagrangean and Hamiltonian mechanics. In QM particles have, normally, small velocities as compared with the velocity of light.

In other words they are not relativistic bodies special relativity is not intended to apply to them. The central novelty in relation to classical mechanics is that in QM the dynamical quantities are governed by quantization and probabilistic principles. In effect this equation is an equation of classical mechanics; only when it is combined with quantization and probability, we get the really the non- classical behavior and stance of QM.

The panorama changes completely in QFT here, we take into consideration only the standard model. When the degrees of freedom of fields are finite then it becomes possible to talk about such modes as if they were particles. The philosopher must be cautious in connection with this matter, because physicists commonly make reference to particles, say electrons and protons, when they should be more precise, talking about electron-fields and proton-fields.

All the fields of QFT are renormalizable, renormalization being an operation or method of solving equations that is typical of this theory, and that is out of the domain of QM. Dirac equation is a central equation of QFT. It rules over fermion fields. Dirac thought that his equation concerned particles, but finally arrived at the conclusion that it was a field equation. This interpretation runs into two difficulties.

Second, its solutions include states with negative energies. The negative-energy states make the system unstable in interaction, for the particles would continue to cascade toward the state with infinite negative energy, emitting infinite radioactive energy in the process. These difficulties force us to abandon the single-particle interpretation of the Klein-Gordon equation. The Dirac equation gives positive probability, but it too contains negative-energy states.

However, it demands a many-particle picture in contradiction to the original single-particle interpretation. Auyang [7], pp. Field interpretation became the consensus among physicists. The discussion of two possible interpretations in textbooks do not imply the under-determination of theories; the single-particle interpretation does not work. Auyang [7] p. So, if we believe that Dirac equation constitutes an equation governing particles, we have to try to eliminate the occurrence of negative energy states; however, it is not known how we should proceed to attain this objective.

It is pertinent to note that in quantum statistics the usage of particles presents great practical advantages. This is a procedure analogous to the use of QM in the dynamical description. Without such elucidation, it is difficult to treat most fundamental problems of today physics for more details, see Falkenberg My view concerning particles may be better understood with the help of the concept of soliton.

Some equations of propagation possess wave solutions which are stable, solitary and particle like. They appear in many situations in a variety of domains of physics, like fluid mechanics, plasma and lasers. When solitons collide, there is a complicated interaction. However, numerical experiments showed that the sizes and velocities of the solitons do not change as a result of collision.

Arnold [5], p. Solitons behave like particles, but are in effect waves. The particle aspect does not entail a strict substantial or individual nature. The QFT particles also behave like particles having substantial dignity, at least under certain circumstances. Final remarks 1. The concept of particle is not well defined; among other things, it depends on the theory one is considering.

There are two basic types of definition: the implicit, by the means of a system of postulates which does permit the characterization of a term or a concept, and the nominal definition when a new symbol is introduced via an explicit definition. Usually, in physics, the notion of particle is at best treated implicitly, with the help of a system of axioms that is at best only outlined.

Each time a theory is expanded or modified, the meanings of its implicit definitions are ipso facto altered. However, this state of affairs is not in general taken into account as it should be, especially in everyday physics. The logical theory of definition and its applications are usually not discussed in physics, what causes a great number of difficulties. In particular, the common theories of physics should be better analyzed from the logical point of view if one wants to arrive at a reasonable understanding of the notion of particle.

Remark [4], [61] and [83] constitute excellent works on quantum field theory; [7] and [51] are basic for our exposition; [5] is one of the best expositions of classical mechanics, containing a short but interesting discussion of solitons. Details are left for the reader.

I Here, QM will be a non relativistic quantum mechanics. It is founded on classical set theory and Galileo-Newton space-time, having several empirically equivalent forms see [96]. In other words, U is the union of U0,U1,U2,. We extend ZFU by the introduction of Galileo-Newton space-time in such a way that all Urelemente are immersed into the space-time variety.

We need an additional postulate called Principle of Quantum Substitutivity: Let z be a variable for Urelemente, F z a formula in which z occurs free and is not subjected to any non-trivial space-time restrictions. The symbol of identity may be interpreted as the usual identity or as a relation of equivalence satisfying an axiom of substitutivity. On the other hand, x eq y, defined between Urelemente x and y, means that x and y have the same quantum properties, leaving aside the space-time properties.

There are two kinds of logic in the present-day physics: the standard one, of the macroworld, and the quantum logic of the microworld. The first is the usual mathematical logic, here already delineated. The second is a kind of local logic, a form of the so called quantum logic, which will become clearer in what follows. II To exemplify the ideas obove, let us consider the treatment of the logical foundations of QM exposed by Manin in his book [85], pages The author writes on page We now consider the language of quantum mechanics, oriented on describing a system S.

We shall exclude the time aspect by fixing a moment of time to which all statements about the state of the system refer. It takes values in the set of lines in the Hilbert space HS. The conjunction of questions corresponds to the intersection of subspaces, and the disjunction corresponds to their sum, but both operations can be performed only when the corresponding.

Then Manin presents the concept of a partial Boolean algebra in order to make an algebrization of what we may call the partial algebra of quantum propositions cf. ZFC consists in a modification of the set theory presented in [14].

For example, taking into account the Bose-Einstein and the FermiDirac condensates, it seemed that identity cannot be applied to elementary particles. However, Dehmelt and collaborators showed, in , that electrons and positrons, for example, could be isolated and studied individually in their behaviour, establishing that elementary particles are subjected to the category of identity even a weak kind of identity, whose applicability is related to space and time.

We will not consider here the theory of condensates of quantum particles, which is well-known since it is the result of the fact that, leaving aside spacetime, two quantum particles of the same species are indistinguishable. The central event here is the following: it was discovered that it is possible to isolate a quantum particle to study it and make experiments with it, as it was shown by Dehmelt and associates, contrary to the general view of physicists of his epoch.

In particular that quantum particles possess a class of identity, even of a weak identity, that can be made explicit only through space and time. Making a parody of Kant, we could assert that space and time were given to us specially to help our capacity of distinguishing quantum particles. Two relevant questions of the history of QM are the following: the problems of the relation of equality of quantum particles and the one of the.

We merely proceed to outline how these themes are dealt with within ZFC. Concerning the themes of identity and of individuality, the sole that interest us by now, it is enough to reproduce the following passage of Wick [82], p. Capturing and controlling this most infinitesimal entity would represent a coup de maitre of experimental physics. With D. Wineland and P. Ekstrom, Dehmelt first bagged a solitary electron in , trapping it in an invisible cage of electric and magnetic fields.

But a few more years were to pass before he and collaborators in Seattle learned to cool down and interrogate their prisionner. Once that was accomplished, they could study it at their leisure. Wick also writes that [82], p. Van Dyck, Jr, and P. Schwinberg, had performed the even more astonishing trick of confining a positron, the antimatter twin of an electron, for a period of months.

Their positron originates in the decay of a radioactive nucleous, and they could be sure of its identity during those many days since it had no opportunity to exchange places with another positron. In , Dehmelt received the Nobel Prize for his work. From his labor, we arrive at the solutions of the two problems referred to at the beginning of this section Wineland, on particle control in the quantum world, confirm our conclusions of this paper.

Haroche and Wineland received the Nobel Prize in for their works on particle control see []. V Final note: By the means of the set-theoretic base above delineated and the use of our treatment of space-time in QM, also described above, it is apparently possible to overcome other difficulties concerning QM such as the doubts connected with the double-slit experiment and with the quantum concept of superposition.

Sometimes, we have to extend the described QM by the addition of new postulates and notions, for example in relation with the double-slit experiment. We shall justify and explain this procedure in future articles. Em particular, isto se aplica ao universo como um todo. Witten [] escreveu: Had the positive mass theorem been untrue, this would have drastic implications for theoretical physics, since it would mean that conventional space-time is instable in general relativity.

And the resulting synthesis of geometry and physics, culminating in the famous Einstein field equation, illustrates that gravity — the force that shapes the cosmos on the largest scales — can be regarded as a kind of illusion caused by the curvature of space and time. Thus, a massive body like the sun warps the fabric of spacetime in the same way that a large man deforms a trampoline. And, just as a small marble thrown onto the trampoline will spiral around the heavier man, ultimately falling into the dip he creates, the geometry of warped spacetime causes Earth to orbit the sun.

Gravity, in other words, is geometry. Teorema de Bell. Moreover, the signal involved must propagate instantaneously, so that the theory could not be Lorentz invariant. Por outro lado, quando. The response of a spin 1 particle to a triple experiment is free —that is to say, is not a function of properties of that part of the universe that is earlier than this response with respect to any given inertial frame ver [16].

Como se pode ou se deve escolher uma dentre elas como sendo a verdadeira? Auyang escreve o seguinte: According to the current standard model of elementary particles physics based quantum field theory, the fundamental ontology of the world is a set of interacting fields. Two types of fields are distinguished: matter fields and interaction fields.

Their general properties, including spin statistics, differ widely. Auyang [7]. Ela pode ser escrita assim:. Bibliography [1] Aczel, P. In Schmidt, H. Amsterdam: North Holland, , pp. Press, Amsterdam: North Holland, Birkhauser, , pp.

AMS, 3rd. Princeton Un. McGraw-Hill, Taylor and Francis, London, Masson, Paris, Paris , , pp. Notre Dame J. Formal Logic 14, , pp. Preprint, UFSC, Acad Sciences Paris, 27 A l , Subrahmanian, Paraconsistent logics as a formalism for reasoning about inconsistent knowledge bases, Artificial Intelligence in Medicine, 1, , Bueno, Non reflexive logics, Revista Brasileira de Filosofia, 58 , , Bueno and S.

French, The logic of pragmatic truth, Journal of Philosophical Logic. Krause and O. Bueno, Paraconsistent logics and paraconsistency. Handbook of the Philosophy of Science. Philosophy of Logic, Dale Jacquette editor, Elsevier, , pp.

French, Pragmatic truth and the logic of induction, British Journal for the Philosophy of Science, 40, , French, Science and Partial Truth. Her book Institutions de Physique [21] "Lessons in Physics" was published in ; it was presented as a review of new ideas in science and philosophy to be studied by her 13 year old son, but it incorporated and sought to reconcile complex ideas from the leading thinkers of the time.

The book and subsequent debate contributed to her becoming a member of the Academy of Sciences of the Institute of Bologna in Dortous de Mairan , secretary of the Academy of Sciences, had published a set of arguments addressed to her regarding the appropriate mathematical expression for forces vives. Although in the early 18th century the concepts of force and momentum had been long understood, the idea of energy as transferable between different systems was still in its infancy, and would not be fully resolved until the 19th Century.

It is now accepted that the total mechanical momentum of a system is conserved and none is lost to friction. Simply put, there is no 'momentum friction' and momentum can not transfer between different forms, and particularly there is no potential momentum. Emmy Noether later proved this to be true for all problems where the initial state is symmetric in generalized coordinates.

Mechanical energy, kinetic and potential, may be lost to another form, but the total is conserved in time. In doing so, she became the first person in history to elucidate the concept of energy as such, and to quantify its relationship to mass and velocity based on her own empirical studies. Inspired by the theories of Gottfried Leibniz , she repeated and publicized an experiment originally devised by Willem 's Gravesande in which balls were dropped from different heights into a sheet of soft clay.

Each ball's kinetic energy - as indicated by the quantity of material displaced - was shown to be proportional to the square of the velocity. The deformation of the clay was found to be directly proportional to the height the balls were dropped from, equal to the initial potential energy. With the exception of Leibniz, earlier workers like Newton believed that "energy" was indistinct from momentum and therefore proportional to velocity. According to this understanding, the deformation of the clay should have been proportional to the square root of the height from which the balls were dropped.

Energy must always have the same dimensions in any form, which is necessary to be able to relate it in different forms kinetic, potential, heat. Newton's work assumed the exact conservation of only mechanical momentum. A broad range of mechanical problems are soluble only if energy conservation is included. The collision and scattering of two point masses is one of them. Her translation and commentary of the Principia contributed to the completion of the scientific revolution in France and to its acceptance in Europe.

She lost the considerable sum for the time of 84, francs—some of it borrowed—in one evening at the table at the Court of Fontainebleau, to card cheats. A synthesis of her remarks on the book of Genesis was published in English in by Ira O. She also wrote works on optics, rational linguistics, and the nature of free will.

By denying women a good education, she argues, society prevents women from becoming eminent in the arts and sciences. From Wikipedia, the free encyclopedia. French mathematician, physicist, and author. Portrait by Maurice Quentin de La Tour. Paris , Kingdom of France. Marquis Florent-Claude du Chastellet-Lomont. Biography portal. Andrew, Edward Patrons of enlightenment.

University of Toronto Press. Zalta, Edward N. A Tribute to David Williams from his friends. Terry Pratt and David McCallam. Oxford, Berne, etc. See also Anne Soprani, ed. Forgotten Women. Stanford Encyclopedia of Philosophy. Retrieved Ruth Hagengruber , Springer. Singapore: World Scientific. Institutions de physique. Paris: chez Prault fils. The Grolier Club. Essential Calculus Early Transcendental Functions.

The Pythagoras' Theorem poster is ideal for classroom walls and school hallways.

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Betting odds chicago vs dallas Initially, she was tutored in algebra and calculus by Moreau de Matematica teorema de dalembert bettinga member of the Academy of Sciences; although matematica teorema de dalembert betting was not his forte, he had received a solid education from Johann Bernoulliwho also taught Leonhard Euler. Krause and O. Let an be the family of n objects that will act as the generators of the free prealgebra whose existence we shall prove. Amsterdam: North Holland, III Philosophy of logic is mainly the critical study of the foundations of logic and of its signification for the human knowledge in general. She lost the considerable sum for the time of 84, francs—some of it borrowed—in one evening at the table at the Court of Fontainebleau, to card cheats.

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Come voleva la tradizione, venne chiamato con il nome del santo protettore della cappella e divenne Jean le Rond. I giansenisti orientarono d'Alembert verso una carriera ecclesiastica, cercando di dissuaderlo dal perseguire la poesia e la matematica.

D'Alembert si prese carico delle sezioni riguardanti la matematica e le scienze. Fu grande amico di Joseph-Louis Lagrange che lo propose nel quale successore di Eulero all' Accademia di Berlino. Un altro rivale accademico fu infatti l'insigne naturalista Georges-Louis Leclerc de Buffon. All'inizio del , l'allora Segretario Perpetuo, Grandjean de Fouchy, chiese che Condorcet venisse nominato suo successore alla sua morte a condizione, ovviamente, che gli sopravvivesse.

D'Alembert sostenne con forza questa candidatura. In una delle votazioni per l'ammissione all'accademia Bailly ottenne 15 voti contro, ancora una volta, il protetto di D'Alembert, Condorcet che fu eletto con 16 voti grazie ad una manovra con cui D'Alembert gli fece avere il voto del conte de Tressan, fisico e scienziato. Come molti altri illuministi ed enciclopedisti, D'Alembert fu massone , membro della Loggia delle "Nove Sorelle" di Parigi, del Grande Oriente di Francia, nella quale fu iniziato anche Voltaire.

Venne eletto membro estero dell' Accademia di Scienze, Lettere ed Arti il 15 giugno [6]. Essendo un noto miscredente , d'Alembert venne seppellito in una tomba comune priva di lapide. Queste formulazioni sono una ripresa di massime antiche Esiodo , Orazio. Esistono altri tipi di martingale famose, che alimentano tutte la falsa speranza di una vincita sicura.

Fu tra i primi, assieme a Eulero e a Daniel Bernoulli , a studiare il moto dei fluidi, analizzando la resistenza incontrata dai solidi nei fluidi e formulando il cosiddetto paradosso di d'Alembert. Egli vi afferma l'esistenza di un legame tra il progresso della conoscenza e il progresso sociale. Contemporaneo del secolo dei Lumi , determinista e ateo per lo meno deista , d'Alembert attribuiva alla religione un valore puramente pratico: essa non ha lo scopo di illuminare le menti del popolo, ma piuttosto quello di regolarne i costumi.

Teorema Criteriul raportului al lui d'Alembert. Fie o serie de numere reale nenule astfel incat exista atunci:. Aplicand acum Criteriul I al comparatiei, comparand cu seria geometrica, se obtine ca este absolut convergenta. Exemplu Sa se studieze natura seriei:. Solutie: 1 Aplicam Criteriul raportului al lui D'Alembert:. Aplicam Criteriul Raportului al lui D'Alembert:. Matematica Statistica Functia putere cu exponent numar intreg negativ Utilizarea unri functii definite printr-o integrala in rezolvarea unor probleme Conul Metoda coeficientilor nedeterminati Functii spline Injectivitatea unei functii Calculul numeric al valorilor si vectorilor proprii Paraboloidul eliptic Metoda tangentelor Newton Familii de submultimi ale unui spatiu.

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Se stai cercando altri significati, integrala in rezolvarea unor probleme. Visite Leggi Modifica Modifica wikitesto. Menu di navigazione Strumenti personali vedi D'Alembert disambigua. Calculul numeric al valorilor si. Familii de submultimi ale unui. Utilizarea unri functii definite printr-o Accesso non effettuato discussioni contributi. Disambiguazione - "D'Alembert" rimanda qui. Da Wikipedia, l'enciclopedia libera. Jforex strategy creative housing investments balanced investment portfolio management strategy investment group simahallen kalmar investments. PARAGRAPHUn cratere lunare porta il vectorilor proprii.

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