Popper conceived an experiment whose analysis led to a result that he deemed absurd. Popper wrote that his reasoning was based on the Copenhagen interpretation and therefore invalidated it. Many authors who have examined Popper's analysis have found in it various technical flaws which are briefly summarized here. However, the aim of the present article is not technical. My concern is to redress logical flaws in Popper's argument: the terminology he uses is ambiguous, his analysis involves counterfactual hypotheses, and it (...) violates Bohr's complementarity principle. Therefore, the absurdity of Popper's result only confirms Bohr's approach. (shrink)

Bell inequalities are derived for any number of observers, any number of alternative setups for each one of them and any number of distinct outcomes for each experiment. It is shown that if a physical system consists of several distant subsystems, and if the results of tests performed on the latter are determined by local variables with objective values, then the joint probabilities for triggering any given set of distant detectors are convex combinations of a finite number of Boolean arrays, (...) whose components are either 0 or 1 according to a simple rule. This convexity property is both necessary and sufficient for the existence of local objective variables. It leads to a simple graphical method which produces a large number of generalized Clauser-Horne inequalities corresponding to the faces of a convex polytope. It is plausible that quantum systems whose density matrix has a positive partial transposition satisfy all these inequalities, and therefore are compatible with local objective variables, even if their quantum properties are essentially non-local. (shrink)

The Einstein–Podolsky–Rosen paradox (1935) is reexamined in the light of Shannon’s information theory (1984). The EPR argument did not take into account that the observer’s information was localized, like any other physical object.

The proof of Bell's inequality is based on the assumption that distant observers can freely and independently choose their experiments. As Bell's inequality isexperimentally violated, it appears that distant physical systems may behave as a single, nonlocal, indivisible entity. This apparent contradiction is resolved. It is shown that the “free will” assumption is, under usual circumstances, an excellent approximation.I have set before you life and death, blessing and cursing: therefore choose life.... —Deuteronomy XXX, 19.

This paper contains four new dialogues among Simplicio, Salviati, and Sagredo, on the fate of Schrödinger's cat, the existence of physical quantities, the paradigm of Einstein, Podolsky, and Rosen, and why a watched kettle may boil, after all.

Linear combinations of “elements of reality,” as defined by Einstein, Podolsky, and Rosen, may not be themselves “elements of reality.” There are questions which can be formulated (and unambiguously answered) in the ordinary language of experimental physics, but cannot be represented in the mathematical framework of quantum theory in a nontrivial way.

The purpose of this paper is to review and clarify the quantum “measurement problem.” The latter originates in the ambivalent nature of the “observer”: Although the observer is not described by the Schrödinger equation, it should nevertheless be possible to “quantize” him and include him in the wave function if quantum theory is universally valid. The problem is to prove that no contradiction may arise in these two conflicting descriptions. The proof invokes the notion of irreversibility. The validity of the (...) latter is questionable, because the standard rationale for classical irreversibility, namely mixing and coarse graining, does not apply to quantum theory. There is no chaos in a closed, finite quantum system. However, when a system is large enough, it cannot be perfectly isolated from its “environment,” namely from external (or even internal) degrees of freedom which are not fully accounted for in the Hamiltonian of that system. As a consequence, the long-range evolution of such a quantum system is essentially unpredictable. It follows that the notion of irreversibility is a valid one in quantum theory and the “measurement problem” can be brought to a satisfactory solution. (shrink)

An imprecise measurement of a dynamical variable (such as a spin component) does not, in general, give the value of another dynamical variable (such as a spin component along a slightly different direction). The result of the measurement cannot be interpreted as the value of any observable that has a classical analogue.

The physicist not only observes phenomena, but he also has an active role in the formulation of some laws. For instance, laws involving irreversibility refer explicitly to what can or cannot be done by physicists. As the abilities of the latter may vary, we obtain sequences of laws, the convergence of which is discussed.

A generalized Kochen-Specker theorem is proved. It is shown that there exist sets of n projection operators, representing n yes-no questions about a quantum system, such that none of the 2″ possible answers is compatible with sum rules imposed by quantum mechanics. Namely, if a subset of commuting projection operators sums up to a matrix having only even or only odd eigenvalues, the number of “yes” answers ought to he even or odd, respectively. This requirement may lead to contradictions. An (...) example is provided, involving nine projection operators in a 4-dimensional space. (shrink)

This dialogue between Achilles and the Tortoise – in the spirit of those of Carroll and Hofstadter – argues against the idea, identified with the “traditional” interpretation of Aristotle’s “sea battle argument”, that future contingents are an exception to the Principle of Bivalence. It presents examples of correct everyday predictions, without which one would not be able to decide and to act; however, doing this is incompatible with the belief that the content of these predictions lacks a truth-value. The cost (...) of using a non-classical logic to cope with that may be too high for Stagirite’s defenders, and they would still need to explain why our ordinary predictions seem to have a binary truth-value. In the end, the paper suggests that the problem of future contingents – and of free will – is not a logical problem at all, but rather a limit on what an agent can believe before taking a decision. (shrink)

The present study investigated 3-year-old children’s learning processes about object functions. We built on children’s tendency to commit scale errors with tools to explore whether they would selectively endorse object functions from a linguistic in-group over an out-group model. Participants ( n = 37) were presented with different object sets, and a model speaking either in their native or a foreign language demonstrated how to use the presented tools. In the test phase, children received the object sets with two modifications: (...) the original tool was replaced by one that was too big to achieve the goal but was otherwise identical, and another tool was added to the set that looked different but was appropriately scaled for goal attainment. Children in the Native language condition were significantly more likely to commit scale errors – that is, choose the over-sized tool – than children in the Foreign language condition (48 vs. 30%). We propose that these results provide insight into the characteristics of human-specific learning processes by showing that children are more likely to generalize object functions to a category of artifacts following a demonstration from an in-group member. (shrink)

Small unmanned aerial systems (sUAS) are used more regularly and widely in disaster response. Like other personnel involved in disaster response, the sUAS pilots work for long periods, experience extreme stress and fatigue. They often arrive at the disaster fatigued (due to long drives to get there). However, unlike other personnel in this domain, there is little research on the effects of fatigue on sUAS pilots. Our experiences with a series of three real-world deployments highlight the challenges of conducting human (...) factors research during disaster response and recovery. We specifically present lessons learned from having participant researchers embedded in three disasters with the sUAS pilot teams. These lessons result in a set of feasible and non-interruptive methods and metrics for conducting human factors research during field events. Preliminary results and recommended next steps are presented. (shrink)

Este artículo investigó al profesional que utiliza el enfoque psicoanalítico en los servicios de salud mental y su imaginación sobre su propio desempeño, centrándose en la visibilización del uso del psicoanálisis en las instituciones. Se trata de una investigación cualitativa-exploratoria que utilizó un cuestionario abierto para siete psicólogos que actúan con la práctica psicoanalítica en servicios de salud mental en dos ciudades de São Paulo. Para el análisis de los datos se utilizó la técnica de análisis de contenido temático. En (...) los relatos, el desafío más notable fue la interposición de la postura profesional del analista en su práctica con su propia evaluación de su trabajo, considerando cómo se identifica con el psicoanálisis, cómo fundamenta y evalúa su actuación y cómo se presenta ante los sujetos y la comunidad, la institución, es decir, cómo el profesional se relaciona con el inconsciente. Como resultados se logró obtener cuatro unidades temáticas, a saber: 1) “Identificación a través del psicoanálisis: el lugar que ocupa el psicoanálisis en la vida del profesional”; 2) “Teoría junto con práctica: ¿qué psicoanálisis es esto?”; 3) “El profesional para el profesional: construyendo su propia imagen” y 4) “Desafíos de la práctica institucional: los diferentes matices”. Por tanto, la práctica psicoanalítica en instituciones es un área en expansión que merece más investigación. La práctica también mostró aceptación entre los profesionales involucrados, destacando que el propio imaginario colectivo del profesional sobre su actuación puede influir en su postura psicoanalítica en la institución. (shrink)

O objetivo deste estudo foi apresentar uma revisão integrativa da literatura científica nacional sobre cuidados paliativos na assistência a portadores de doenças graves, evidenciando, principalmente, o papel das equipes multidisciplinares. Foram recuperadas, a partir de critériosde localização e se..

A partir de uma revisão crítica da literatura, estuda-se um desafio do anarquismo filosófico à teoria da autoridade jurídica de J. Raz: seguir uma ordem de que se discorda seria irracional, pois equivaleria a agir contra o que se considera mais justificado. Utilizando referências atinentes à teoria da decisão e à epistemologia, além de exemplos sobre ferramentas de auxílio à tomada de decisão do cotidiano (como experts e programas), esboçamos duas possíveis respostas, que correspondem a duas concepções instrumentais distintas de (...) autoridade: numa, é justificável para o agente colocar-se numa situação que o leve a agir de forma inconsistente com suas crenças – a ideia de “submeter-se à autoridade”, afim a uma “confiança cega”; noutra, utilizando a teoria dos “pontos-cegos”, delineiam-se restrições que uma teoria da racionalidade impõe à teoria da autoridade. (shrink)

O objetivo do artigo consiste em apresentar alguns fios da relação entre a noção de sensus communis, a história e a política em Kant, de modo que se estabeleçam as bases de uma análise da filosofia da história de Kant como o equibalente, para sua filosofia político-jurídica, do esquematismo dos conceitos puros.

A pair of spin-j particles, prepared in a singlet state, move away from each other and are examined by two distant observers. If the latter are able to discriminate between the2j+1 values of a component ofJ, there are pairs of observables whose correlation strongly violates Bell's inequality, for arbitrarily large j. However, if neighboring values are lumped together because of limited instrumental resolution, the observable correlations tend to those predicted by classical mechanics.

The city of lions. Beaulieu-sur-Dordogne. The war starts. Drôle de guerre. Going to work. Going to school. Fleeing from village to village. Playing cat and mouse. The second landing. Return to Beaulieu. Return to Paris. Joining the boyscouts. Learning languages. Israel becomes independent. Arrival in Haifa. Kalay high school. Military training. The Hebrew Technion in Haifa. Relativity. Asher Peres. Metallurgy. Return to France. Escape from jail. Aviva.I am the cat who walks by himself, and all places are alike to me.Rudyard (...) KiplingI am grateful to all those who contributed to this Festschrift which celebrates my 70th birthday and therefore the beginning of my eighth decade. In the Jewish religion, there is a prayer, “she-hehhyanu” to thank the Lord for having kept us alive and let us reach this day. I am an atheist and I have no Lord to thank, but I wish to thank many other people who are no longer alive and who helped me reach this point. (shrink)

The most efficient way of obtaining information about the state of a quantum system is not always a direct measurement. It is sometimes preferable to extend the original Hilbert space of states into a larger space, and then to perform a quantum measurement in the enlarged space. Such an extension is always possible, by virtue of Neumark's theorem. The physical interpretation usually given to that theorem is the introduction of an auxiliary quantum system, prepared in a standard state, and the (...) execution of a quantum measurement on both systems together. However, this widespread interpretation is unacceptable, because the statistical properties of the supposedly standard auxiliary system are inseparably entangled with those of the original, unknown system. A different method of preparing the auxiliary system is proposed, and shown to be physically acceptable. (shrink)

It is well known that in the first edition of Logical Investigations , Husserl defines the research field of phenomenology as a psychological immanence. However, if we closely examine the criteria used for defining the psychological immanence, we find that they imply certain conception of transcendence of the intentional object. This conception of transcendence leads to epistemological problems concerning the relationship between the physical object and the object of perception. After all, it would be correct to say that the physical (...) object is transcendent in the same sense which it is stated that the perceived object is transcendent to the experience of perceiving? This article seeks to show how the transcendental turn of 1906/1907 and the consequent distinction between three concepts of immanence and transcendence in his work Idea of Phenomenology contributed to solving such problems. (shrink)

O objetivo deste trabalho é examinar a crítica ao psicologismo de Edmund Husserl paraavaliar sua posição no que diz respeito à psicologia empírica. Procurarei mostrar, em primeirolugar, que Husserl, em Investigações lógicas, tem como alvo o psicologismo lógico e umadeterminada forma de psicologismo epistemológico. Em segundo lugar, buscarei mostrar quea fundamentação epistemológica da lógica pura, como ciência teórica, implica em uma teoriada subjetividade. Um dos objetivos de Husserl em Investigações lógicas é empregar afenomenologia, entendida como forma peculiar de psicologia descritiva, (...) para elaborar umanova teoria da subjetividade, por meio de uma análise descritiva das vivências envolvidas naobtenção do conhecimento teórico. Depois irei discutir o lugar que a psicologia empírica passaa ocupar depois da crítica ao psicologismo em Investigações lógicas. (shrink)

“Elements of reality” are defined as in the work of Einstein, Podolsky, and Rosen. It is further assumed that the sum or product of twocommuting elements of reality also is an element of reality. An algebra contradiction ensues.

Translation into Portuguese of SEP entries on Philosophy of Economics.

The Purūravac-cakkiravartti-katai, “The Story of Emperor Purūravas,” is a pre-modern Tamil folk telling of the ancient Urvaśī-Purūravas legend. The classical narrative of King Purūravas of the Lunar Dynasty tells about his love affair with the celestial nymph Urvaśī, their tragic separation, and final reunion. The PCK follows the classical narrative closely, but interposes a long account of other exploits of Purūravas, which do not appear in any of the Sanskrit tellings of the story. In this supplement, which I call “The (...) Tamil Life of Purūravas,” Purūravas faces a tragic chain of unavoidable events, but eventually restores his former status through meditation and devotion. A comparative examination of the two parts of the text, that is, the classical narrative and the Tamil Life, shows that the latter generates an inverted mirror image of the fundamental notions implied in the classical narrative. The outcome of this structure is a shift in the ideological tendencies of the narrative toward a local ethos and popular religious notions. The PCK is thus shown to be a field of cultural negotiations, in which opposing ideologies contend for superiority, and its structure can be regarded as a transformative mechanism applied by local and popular cultural forms to enable appropriation of classical narrative traditions. (shrink)