In cortical neurones, analogue dendritic potentials are thought to be encoded into patterns of digital spikes. According to this view, neuronal codes and computations are based on the temporal patterns of spikes: spike times, bursts or spike rates. Recently, we proposed an ‘action potential waveform code’ for cortical pyramidal neurones in which the spike shape carries information. Broader somatic action potentials are reliably produced in response to higher conductance input, allowing for four times more information transfer than spike times alone. (...) This information is preserved during synaptic integration in a single neurone, as back‐propagating action potentials of diverse shapes differentially shunt incoming postsynaptic potentials and so participate in the next round of spike generation. An open question has been whether the information in action potential waveforms can also survive axonal conduction and directly influence synaptic transmission to neighbouring neurones. Several new findings have now brought new light to this subject, showing cortical information processing that transcends the classical models. BioEssays 29: 178–187, 2007. © 2007 Wiley Periodicals, Inc. (shrink)

It was shown in Dirac A117, 610; A118, 351, 1928) that the ultra-violet divergence in quantum electrodynamics is caused by a violation of the time-energy uncertainly relationship, due to the implicit assumption of infinitesimal time information. In Wheeler et al. it was shown that Einstein’s special theory of relativity and Maxwell’s field theory have mathematically equivalent dual versions. The dual versions arise from an identity relating observer time to proper time as a contact transformation on configuration space, which leaves phase (...) space invariant. The special theory has a dual version in the sense that, for any set of n particles, every observer has two unique sets of global variables \\) and \\) to describe the dynamics, where \ is the canonical center of mass. In the \\) variables, time is relative and the speed of light is unique, while in the \\) variables, time is unique and the speed of light is relative with no upper bound. In the Maxwell case, the two sets of particle wave equations are not equivalent. The dual version contains an additional longitudinal radiation term that appears instantaneously with acceleration, leading to the prediction that radiation from a cyclotron will not produce photoelectrons. A major outcome is the dual unification of Newtonian mechanics and classical electrodynamics with Einstein’s special theory of relativity, without the need for point particles, without a self-energy divergency and, without need for the problematic Lorentz–Dirac equation. The purpose of this paper is to introduce the dual theory of relativistic quantum mechanics. In our approach, we obtain three distinct dual relativistic wave equations that reduce to the Schrödinger equation when minimal coupling is turned off. We show that the dual Dirac equation provides a new formula for the anomalous magnetic moment of a charged particle. We can obtain the exact value for the electron g-factor and phenomenological values for the muon and proton g-factors. (shrink)

Gilles Deleuze’s research during the 1980s focused on the 17th century German thinker G. W. Leibniz. In 1988, Deleuze published Le Pli, which forms part of a series of works on modern philosophy. This book displays Deleuze’s attention to the interpretations of contemporary commentators on modern philosophy, in this case, on Leibniz. In this context, there occurred a brief and important dialogue between Deleuze and Christiane Frémont, the French commentator and translator of Leibniz, with regard to their respective interpretations of (...) the great German philosopher. This article intends to give an account of the main topics present in that conversation. Firstly, we can say they involve 1) the problem of body and the Leibnizian vinculum substantiale, 2) the question of singularities, 3) the principle of economy and incompossibility, and 4) the Deleuzian concept of vice-diction. Our hypothesis in this study is that the readings made by both authors of the German thinker are mutually involved. It is essential, in order to support this hypothesis, to make precise the demarcations of relations between such readings. For this reason, our research will focus on Frémont’s study Singularités, individus et relations dans le système de Leibniz (2003) and on Deleuze’s work Le Pli (1988). We hope to determine the topics that emerge in the relationship, and to specify convergences and divergences of interpretation. (shrink)

Los orígenes intelectuales del nacionalismo y de su idea de cultura hallan en la obra del pensador alemán Johann G. Herder (1744-1803) una referencia ineludible. Herder propuso una versión de la Ilustración contraria a la oficial, crítica con las políticas del reformismo burocrático del absolutismo y con el racionalismo filosófico kantiano. La versión de la Ilustración de Herder participa de un sentido de la historia abierto a la diversidad cultural. La lengua y la cultura emergen del planteamiento de Herder como (...) las cifras de un mundo popular utópicamente imaginado de espaldas a la lógica del poder monárquico y aristocrático. La idea nacionalista de cultura elaborada por el pensador alemán nos obliga a reconsiderar, de una manera crítica, los orígenes románticos del nacionalismo. (shrink)

El libro de Osvaldo Torres Gutiérrez, es un trabajo descriptivo, bien documentado y fundamentado en el uso de fuentes y bibliografía general y específica sobre el tema en cuestión, siendo uno de los aspectos más importantes las entrevistas realizadas a dirigentes de las dos organizaciones político revolucionarias que son el centro de su análisis.En las primeras líneas, el autor deja establecida la pregunta sobre la cual girará su trabajo, “por qué dos organizaciones de la izquierda revolucion..

Lorenzo Peña y Gonzalo has developed a logic, a legal philosophy and a political thought of a deeply neo-Leibnizian nature. The neo-Leibnizian mark characterizes both his philosophical thesis and the terms has coined in his contributions to the theory of knowledge, theodicy, ontology, political philosophy, etc. Above all, this mark is present in his conception of Law and of the logic of legal situations. Under the light of the political problems and crossroads of the present time, this interview allows (...) for an approach to some of the intellectual findings in his work. (shrink)

This paper examines a possible bond between the political idea of Spinoza and Hegel, focusing on the notion of freedom as a cornerstone. It is structured in the terms of a comparative study according to three dimensions: the critique of freedom understood as free will, the conception of freedom as self-determination, and the inextricable link between freedom and the State. Instead of Pierre Macherey’s proposal, who claims “Hegel or Spinoza”, we affirm “Hegel and Spinoza”.

Nuestro interés en el presente trabajo es, efectivamente, enfocarnos en la temática de las corporaciones, pero centrándonos en dos autores en particular: Thomas Hobbes y Georg Wilhelm Friedrich Hegel. Como se verá, mientras que Hobbes referirá a las corporaciones como empresas, Hegel las aludirá como asociaciones (encargadas de anexar la sociedad civil con el Estado). Es a estos fines que estructuraremos el presente trabajo en tres tiempos. En primer lugar, explicaremos cómo las corporaciones surgen de acuerdo a las teorías de (...) ambos autores. Luego elucidaremos la forma en que las mismas funcionan y se encuentran conformadas. Finalmente, en tercera instancia dilucidaremos la relación que las corporaciones mantienen con el Estado tanto en Hobbes como en Hegel. (shrink)

In this paper art history and visual studies, the disciplines that study visual culture, are presented as a field whose conjectural paradigm can be used to understand the epistemic problems associated with abduction. In order to do so, significant statements, concepts and arguments from the work of several specialists in this field have been highlighted. Their analysis shows the fruitfulness and potential for understanding the study of visual culture as a field that is interwoven with the assumptions of abductive cognition.

Using a recent result of Busch and Gudder, we reconsider a theorem of Ludwig which allows one to identify a class of effect automorphisms as the symmetry transformations in quantum mechanics.

RESUMO O objetivo deste artigo é analisar a concepção de liberdade encontrada em "Discourses concerning government" de Algernon Sidney. Mantendo a perspectiva republicana, a liberdade é definida pela ausência de dominação, ou seja, pela não submissão, sujeição ou exposição à vontade arbitrária de outra pessoa; e assumindo a perspectiva jusnaturalista, a liberdade é considerada um direito natural, inerente à condição humana, que deve ser preservado e assegurado pela autoridade política. Pretende-se discutir como Sidney articula essas duas perspectivas em sua teoria (...) política, projetando a concepção republicana de liberdade na modernidade.ABSTRACT The objective of this paper is to analyze the concept of freedom found in Algernon Sidney’s "Discourses Concerning government". Keeping the republican thought, freedom is defined by the absence of domination, i.e., the denial of submission, bondage or exposure to the arbitrary will of another person; and taking the jusnaturalist thought, freedom is considered a natural right inherent to the human condition, which must be preserved and guaranteed by the political authority. I intend to discuss how Sidney articulates these two perspectives in his political theory, outlining the republican conception of freedom in modernity. (shrink)

Este artigo pretende discutir os conceitos de direito natural e propriedade no Iuri universi distributio (1578) e as suas conseqüências políticas no Methodus ad facilem historiarum cognitionem (1566) e no Les Six Livres de la République (1576), de Jean Bodin.

This article aims to discuss the concepts of natural right and property in Bodin's Iuri distributio universi and the political consequences of these ideas in Methodus ad facilem historiarum cognitionem and Les Six Livres de la République .Este artigo pretende discutir os conceitos de direito natural e propriedade no Iuri universi distributio e as suas conseqüências políticas no Methodus ad facilem historiarum cognitionem e no Les Six Livres de la République , de Jean Bodin.

Como casi todos los conceptos fi losófi cos, el de «validez normativa» tiene altos grados de ambigüedad y de vaguedad. En este trabajo me encargo de analizar la postura de distintos autores que han tratado de dar respuesta a la pregunta ¿qué significa que una norma sea «válida»? Para ello, tomo como hilo conductor la obra de Ernesto Garzón Valdés. Esto se debe a que los trabajos de Ernesto Garzón dedicados a este tema, le ofrecen al lector un análisis crítico (...) y comprensivo de algunas de las posturas teóricas más relevantes sobre el concepto de validez normativa. Asimismo, trabajar a través de su obra tiene un doble benefi cio: por un lado, no sólo nos permite conocer a fondo la postura teórica de autores que pertenecen a distintas corrientes del pensamiento, como Hans Kelsen, H.L.A. Hart, Francisco Suárez o von Wright por ejemplo, sino que, por el otro, nos permite conocer la postura del mismo Garzón y sus críticas a los diferentes modelos conceptuales. (shrink)

The tree-based data structure of -tree for propositional formulas is introduced in an improved and optimised form. The -trees allow a compact representation for negation normal forms as well as for a number of reduction strategies in order to consider only those occurrences of literals which are relevant for the satisfiability of the input formula. These reduction strategies are divided into two subsets (meaning- and satisfiability-preserving transformations) and can be used to decrease the size of a negation normal form A (...) at (at most) quadratic cost. The reduction strategies are aimed at decreasing the number of required branchings and, therefore, these strategies allow to limit the size of the search space for the SAT problem. (shrink)

Gentile's philosophy merits the attention of every serious thinker, for it presents the doctrine that reality is spiritual in a more uncompromising form than is to be found elsewhere, and claims to solve on this principle all the great problems that have beset the history of metaphysic. His own name for it is Absolute or Actual Idealism . For Gentile, nothing is real but the Spirit, and by the Spirit he means the pure act of self-conscious thinking. “The subject that (...) conceives itself in conceiving All is the reality itself.” In the act of conscious thinking, the Spirit is present in its entirety as subject ; generating therein by its own creative spontaneity a world of objects, and resolving the products of this act of objectification into the womb that gave them birth. In this immanent dialectic–pure subject , pure object , subject-object –lies the rhythmic life-history of the Spirit. “Our doctrine,” writes Gentile, “is the theory of the Spirit as act which posits its object in a multiplicity of objects, resolving their multiplicity and objectivity in the unity of the subject itself.” For such a doctrine, transcendence is the enemy, the Goliath whom Gentile has gone forth to slay. He confronts us, on almost every page of his writings, with an ineluctable dilemma. Either a philosophy of sheer immanence, or reality is unknowable. (shrink)

The two basic forms of action distinguished in the preceding articles, viz., moral action, where praxis is for praxis sake, and action for a good, where praxis is for the sake of theôria, are found in close relationship to one another in human life. The part they play is rather that of abstract moments in a practical process than that of self-contained and isolable bits of conduct. No philosopher is likely to discount the importance of thus analysing the concrete into (...) its factors before he rectifies the abstraction by showing how they co-operate in actual experience. In any individual biography we can find acts and courses of action in which duty is the dominant motive, and others in which the dominant motive is desire of good. Similarly, when we compare different biographies with one another, some exemplify most strikingly the struggle for righteousness against unruly passion, others the spontaneous aspiration of the soul to attain the goal of its desire. But neither the moral law nor the summum bonum wields an exclusive sovereignty. St. Paul and Luther, in their warfare against carnal desire, drew strength from the ideal vision; nor were St. Bernard or Spinoza, for all their absorption upon union with the divine, strangers to the call of moral obligation. In the lives of ordinary men, the types of conduct are, perhaps, more evenly balanced; yet here also the distinction is discernible. Moreover, it is easy to see how, despite their intrinsic difference, they come to be associated and “by just exchange” to effect a mutual enrichment. (shrink)

In human groups performing oscillatory tasks, it has been observed that the frequency of participants' oscillations reduces when compared to that acquired in solo. This experimental observation is not captured by the standard Kuramoto oscillators, often employed to model human synchronization. In this work, we aim at capturing this observed phenomenon by proposing three alternative modifications of the standard Kuramoto model that are based on three different biologically-relevant hypotheses underlying group synchronization. The three models are tuned, validated and compared against (...) experiments on a group synchronization task, which is a multi-agent extension of the so-called mirror game. (shrink)