655 research outputs found
Denis Fisette (dir.), Husserlâs Logical Investigations reconsidered, Dordrecht, Boston, Londres, Kluwer, coll. «Contributions to Phenomenology», 2003, 252 pages.
International audienc
Dire et penser âjeâ: la vacuitĂ© de la prĂ©sence Ă soi du sujet de Husserl Ă Derrida
According to Jacques Derrida, the tradition of metaphysics is dominated by a basic distinction between presence and absence that plays a fundamental role in Husserlâs theory of meaning and contaminates the core of his phenomenological project. If Husserlâs distinction between indication and expression in the 1st Logical Investigation is credited for opening a âphenomenological breakthroughâ, his account of the entwinement between the indicative and expressive functions of linguistic signs is accused of restoring and maintaining the metaphysical primacy of presence.
In the last chapters of Voice and Phenomenon, Derrida focuses especially on the cases of indexical or âessentially occasionalâ expressions, whose concrete meaning is a function of the occasion of their use and which rely on the indicative function of meaning. According to Derridaâs reading, Husserl holds that such indexical meanings like âIâ, âhereâ or ânowâ, are necessarily always fulfilled and cannot lack of intuitive fulfilment. Consequently Derrida takes Husserlâs account of the meaning of âIâ as an obvious symptom of his inability to move away from the myth of pure expressivity, bringing phenomenology back into the history of metaphysics. Husserl would have failed to acknowledge that indexical meanings, like ideal or objective meanings, can remain unfulfilled and deprived of intuition. This article demonstrates that Derridaâs critique misses the most important point in Husserlâs analysis of the meaning of âIâ, and argues that indexical or subjective expressions are somehow insensitive to the prospect of intuitive presencing and fulfilment
A.S. convergence for infinite colour P\'olya urns associated with stable random walks
We answer Problem 11.1 of Janson arXiv:1803.04207 on P\'olya urns associated
with stable random walk. Our proof use neither martingales nor trees, but an
approximation with a differential equation.Comment: 8 page
A Methodology For Parametrizing Discrete Model of Biological Networks
Humans have always had the desire to understand the world that surrounds us. With the progress of science in the last decades, our knowledge has drastically increased, following the fast pace at which scientists obtain and publish new results. With this rapid increase in the volume of available information about the systems that scientists study, modeling has become crucial in the process of learning and understanding these systems. In biology, models can be developed to capture different system scales. Here, we are focusing on modeling cellular signaling networks, using a discrete modeling approach, where system components are represented as discrete variables, and their regulatory functions are approximated with logical, weighted sum, or min-max functions. We study cellular signaling networks through stochastic simulation, in which model switches from one state to another according to elementsâ regulatory functions. To start simulations, we define scenarios of interest (e.g., cell activation to induce fate change, or a drug added to a cancer cell). These scenarios are implemented through parametrizing the model, that is, assigning initial values to all model elements, as well as defining patterns at model inputs, or perturbations inside the model. However, the information about the initial state is most often incomplete, as experts are familiar with values in some parts of the network, but not in the whole network. We have developed several methods to initialize model elements when the knowledge about the initial values for a particular scenario is sparse. Next, we applied our initialization methods on several cancer cell models. Our results show that varying the initial values can significantly influence model behavior, and therefore, emphasize the importance of choosing a suitable initialization method. We expect that our methods and the conclusions from our studies will enable more accurate setup of future modeling experiments
Les évaluations environnementales stratégiques dans le développement nordique du Québec : une perspective crie
Le Plan Nord et le Nord pour tous sont des projets de dĂ©veloppement du territoire du QuĂ©bec septentrional faisant lâobjet dâune certaine controverse. Cela est dâautant plus vrai pour la population vivant sur ce territoire et en particulier les Cris qui sâinquiĂštent que lâouverture du territoire puisse affecter nĂ©gativement la pratique de leurs activitĂ©s ancestrales et apporter de nombreux effets indĂ©sirables. Bien que ce genre de dĂ©veloppement puisse ĂȘtre encadrĂ© par un processus dâĂ©valuation environnementale, le modĂšle adoptĂ© par le QuĂ©bec ne semble pas adaptĂ© Ă la situation. Lâadoption dâun modĂšle dâĂ©valuation environnementale stratĂ©gique apparaĂźt comme une option trĂšs viable, mais le gouvernement du QuĂ©bec ne donne pas lâimpression dâaller de lâavant. Cet essai prĂ©sente la nĂ©cessitĂ© dâadopter le modĂšle de lâĂ©valuation environnementale stratĂ©gique dans le contexte du dĂ©veloppement du Nord quĂ©bĂ©cois : le Nord pour tous. Ce type dâĂ©valuation environnementale a lâavantage de mieux rĂ©pondre aux principes du dĂ©veloppement durable que les Cris, dans leur culture, ont intĂ©grĂ©s depuis quâils vivent sur ce territoire. DĂ©velopper le Nord quĂ©bĂ©cois selon une perspective crie et en utilisant le modĂšle de lâĂ©valuation environnementale stratĂ©gique constituerait une formidable occasion pour le QuĂ©bec de faire un pas dans la bonne direction. Tout au long de cet essai, la dĂ©monstration de la nĂ©cessitĂ© de lâadoption du modĂšle de lâĂ©valuation environnementale stratĂ©gique est faite. GrĂące Ă cela, le gouvernement du QuĂ©bec pourra user de son expertise dans le domaine de lâĂ©valuation environnementale qui est compatible avec le modĂšle dĂ©sirĂ© et qui permettra dâĂȘtre plus juste avec les Cris, et les peuples autochtones en gĂ©nĂ©ral, en leur accordant une place de collaborateurs tout au long du processus de planification du dĂ©veloppement du territoire sur lequel ils vivent. Les recommandations de cet essai se basent sur une sĂ©rie dâarguments rĂ©sultant de lâanalyse de la situation et de la possibilitĂ© de lâadoption du modĂšle dâĂ©valuation environnementale stratĂ©gique selon une perspective crie
SĂ©minaire « Police, ordre public et insĂ©curité », Institut dâĂ©tudes politiques de Paris
CrĂ©Ă© Ă lâinitiative du Professeur Pierre Favre, le sĂ©minaire intitulĂ© « Police, ordre public et sĂ©curité » a vu le jour Ă la rentrĂ©e 1999 Ă lâInstitut dâĂ©tudes politiques de Paris. Lors de sa premiĂšre annĂ©e dâexistence, ce sĂ©minaire a Ă©tĂ© divisĂ© en deux pĂ©riodes : dans un premier temps, des cours ont Ă©tĂ© dispensĂ©s par Pierre Favre, professeur Ă lâIEP de Paris, et Dominique Monjardet, chercheur au CNRS, afin dâasseoir les connaissances thĂ©oriques des participants en matiĂšre de police et de sĂ©..
Uniform attachment with freezing: Scaling limits
We investigate scaling limits of trees built by uniform attachment with
freezing, which is a variant of the classical model of random recursive trees
introduced in a companion paper. Here vertices are allowed to freeze, and
arriving vertices cannot be attached to already frozen ones. We identify a
phase transition when the number of non-frozen vertices roughly evolves as the
total number of vertices to a given power. In particular, we observe a critical
regime where the scaling limit is a random compact real tree, closely related
to a time non-homogenous Kingman coalescent process identified by Aldous.
Interestingly, in this critical regime, a condensation phenomenon can occur.Comment: 31 pages, 7 figures. This is the second part of a project made by the
same authors. In V2 : More detailed introduction, and weaker assumption
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