119 research outputs found

    Greenberg approximation and the geometry of arc spaces

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    We study the differential properties of generalized arc schemes, and geometric versions of Kolchin's Irreducibility Theorem over arbitrary base fields. As an intermediate step, we prove an approximation result for arcs by algebraic curves

    Invariant de Serre et fibre de Milnor analytique

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    A comprehensive resource for retrieving, visualizing, and integrating functional genomics data

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    The enormous amount of freely accessible functional genomics data is an invaluable resource for interrogating the biological function of multiple DNA-interacting players and chromatin modifications by large-scale comparative analyses. However, in practice, interrogating large collections of public data requires major efforts for (i) reprocessing available raw reads, (ii) incorporating quality assessments to exclude artefactual and low-quality data, and (iii) processing data by using high-performance computation. Here, we present qcGenomics, a user-friendly online resource for ultrafast retrieval, visualization, and comparative analysis of tens of thousands of genomics datasets to gain new functional insight from global or focused multidimensional data integration.\ua0\ua9 2019 Blum et al

    Motivic Serre invariants, ramification, and the analytic Milnor fiber

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    We show how formal and rigid geometry can be used in the theory of complex singularities, and in particular in the study of the Milnor fibration and the motivic zeta function. We introduce the so-called analytic Milnor fiber associated to the germ of a morphism f from a smooth complex algebraic variety X to the affine line. This analytic Milnor fiber is a smooth rigid variety over the field of Laurent series C((t)). Its etale cohomology coincides with the singular cohomology of the classical topological Milnor fiber of f; the monodromy transformation is given by the Galois action. Moreover, the points on the analytic Milnor fiber are closely related to the motivic zeta function of f, and the arc space of X. We show how the motivic zeta function can be recovered as some kind of Weil zeta function of the formal completion of X along the special fiber of f, and we establish a corresponding Grothendieck trace formula, which relates, in particular, the rational points on the analytic Milnor fiber over finite extensions of C((t)), to the Galois action on its etale cohomology. The general observation is that the arithmetic properties of the analytic Milnor fiber reflect the structure of the singularity of the germ f.Comment: Some minor errors corrected. The original publication is available at http://www.springerlink.co

    History of consciousness: from aristotelianism to philosophy of mind

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    La présente thèse de doctorat s'est fixée pour objectif de retracer l'histoire du concept de conscience mentale à travers les langages de spécialité (la philosophie et la psychologie principalement), et ce au cours de la période qui va de l'Antiquité (avec l’aristotélisme) jusqu'à notre époque (avec la philosophie de l’esprit). Ce travail nous a, tout d'abord, amené à redéfinir la conscience sous un jour nouveau, aussi bien en tant que concept pur et dur (dimension déjà présente chez Aristote et chez les penseurs pré-modernes) qu'en tant qu'outil de diverses philosophies chargées de fonder la connaissance et les sciences (dimension opérante à partir de Descartes), puis en tant que philosophie (nous pensons principalement à la philosophie de l'esprit). Une telle entreprise nous a ainsi permis de proposer une définition inédite de la conscience mentale, qui se nourrit des différents paradigmes étudiés tout au long de son histoire. Plus spécifiquement, le "méta-paradigme conscientiel" ainsi généré (aussi nommé "paradigme de type 1") propose une définition en intension, une définition en extension (à savoir une typologie), ainsi qu'un cadre onto-épistémologique servant de toile de fond. Dans le même temps, nous avons été amené à élaborer une épistémologie générale capable d'analyser les différents "paradigmes de type 0" que nous avons rencontrés - et qui se présentent sous diverses formes (des doctrines et des théories philosophiques, des théories scientifiques, des dogmatismes). Cette épistémologie - sous-tendue par quatre critères qui permettent de distinguer les paradigmes entre eux, et dont rend compte notre méta-paradigme - s'avère en outre pensée dans la perfectibilité et dans la complexité, étant ouverte aux futurs paliers d'une échelle de la conscience qui n'a pas fini de s'écrire. De cette manière, nous évitons, avec Donald Davidson, l'écueil qui consiste à voir le "conscientiel" (la conscience comme les productions de l'esprit) comme le simple prolongement du matériel – ce qui nous interdirait, par exemple, de nous interroger sur la "possibilité d'une conscience" au-delà même du vivant./The aim of this thesis was to trace the history of consciousness through philosophy and psychology, from Antiquity (Aristotelianism) to our time (Philosophy of Mind). In a first time, this work led us to define consciousness in a new light, as well as concept (which already appears in Aristotle and in medieval thinkers) and as a tool for various philosophies that try to found knowledge and sciences (this dimension will be born from Descartes), then as a philosophy (we think about the philosophy of mind). This also allowed us to propose a new definition of consciousness, which is inspired by different paradigms studied throughout its history. More specifically, our “metaparadigm” (or "type 1 paradigm") contains a definition and a typology of consciousness, and is underpinned by an onto-epistemological framework. At the same time, we tried to develop a general epistemology able to analyze “type 0 paradigms” we met (these paradigms can be philosophical doctrines, philosophical theories, scientific theories or dogmas). Open to future levels of consciousness’scale that is not finished, this epistemology - underlied by four criteria that distinguish them paradigms, and which are constitutive of our “metaparadigm” - is also favorable to the perfectibility and the complexity. In this way, we especially avoid, with Donald Davidson, the mistake of considering consciousness and all products of mind, thought or cultur just as an extension of material reality - which would prevent us, for example, to wonder about the possibility that consciousness might exist in “non-living beings”.Doctorat en Langues et lettresTHPHILOinfo:eu-repo/semantics/nonPublishe

    Motivic invariants of rigid varieties, and applications to complex singularities

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