Дисертації з теми "Actions rationnelles"
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Gouthier, Bianca. "Actions rationnelles de schémas en groupes infinitésimaux." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0123.
Повний текст джерелаThis thesis focuses on the study of (rational) actions of infinitesimal group schemes, with a particular emphasis on infinitesimal commutative unipotent group schemes and generically free actions and faithful actions. For any finite k-group scheme G acting rationally on a k-variety X, if the action is generically free then the dimension of Lie(G) is upper bounded by the dimension of the variety. We show that this is the only obstruction when k is a perfect field of positive characteristic and G is infinitesimal commutative trigonalizable. If G is unipotent, we also show that any generically free rational action on X of (any power of) the Frobenius kernel of G extends to a generically free rational action of G on X. Moreover, we give necessary conditions to have faithful rational actions of infinitesimal commutative trigonalizable group schemes on varieties, and (different) sufficient conditions in the unipotent case over a perfect field. Studying faithful group scheme actions on a variety X yields information on representable subgroups of the automorphism group functor AutX of X. For any field k, PGL2,k represents the automorphism group functor of P1 k and thus subgroup schemes of PGL2,k correspond to faithful actions on P1 k. Moreover, PGL2,k(k) coincides with the Cremona group in dimension one, i.e. birational self-maps of P1 k, since any rational self-map of a projective non-singular curve extends to the whole curve. In positive characteristic, the situation is completely different if we consider rational actions of infinitesimal group schemes. Most of the faithful infinitesimal actions on the affine line do not extend to P1 k. If the characteristic of a field k is odd, any infinitesimal subgroup scheme of PGL2,k lifts to SL2,k. This is not true in characteristic 2 and, in this case, we give a complete description, up to isomorphism, of infinitesimal unipotent subgroup schemes of PGL2,k. Finally, we prove a result that gives an explicit description of all infinitesimal commutative unipotent k-group schemes with one-dimensional Lie algebra defined over an algebraically closed field k, showing that there are exactly n non-isomorphic such group schemes of fixed order pn
Zuanon, Magali. "Les incidences de la liquidité imparfaite sur le marché des actions : réflexions et validations sur le marché français." Paris 9, 2000. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=2000PA090071.
Повний текст джерелаMorel, Christophe. "Bulle, engouement et formation des anticipations." Paris 9, 2000. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=2000PA090072.
Повний текст джерелаCoutant, Sophie. "Contenu en informations dans les prix d'options : estimation de la densité neutre au risque du sous-jacent et applications." Paris 9, 2001. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=2001PA090024.
Повний текст джерелаThis thesis is concerned by the information content in option prices. More precisely, a first part consists in estimating the risk neutral distribution of the option underlying asset. In a second part, we study the feasible applications of the knowledge of this risk neutral density : expectations analysis of markets participants using confidence intervals, tests of expectation hypothesis, estimation of market participants risk aversion function
Liendo, Alvaro. "T-variétés affines : actions du groupe additif et singularités." Phd thesis, Grenoble, 2010. http://www.theses.fr/2010GRENM015.
Повний текст джерелаAT -variety is an algebraic variety endowed with an effective action of an algebraic toms T. This thesis is devoted to the study of two aspects of normal affine T-varieties: the additive group actions and the characterization of singularities. Let X=spec A be a normal affine T-variety and let D be a homogeneous locally nilpotent derivation on the normal affine Z"n-graded domain A, so that D generates an action of the additive group on X. We provide a complete classification of pairs (X,D) in three cases: for toric varieties, in the case where the complexity is one, and in the case where D is of fiber type. As an application, we compute the homogeneous Makar-Limanov (ML) invariant of such varieties. We deduce that any variety with trivial ML-invariant is birationally decomposable as Y\times P"2, for sorne variety Y. Conversely, given a variety Y, there exists an affine T-variety X with trivial ML invariant birational to Y\times P"2. Ln the second part concerning singularities of a T-variety X we compute the higher direct images of the structure sheaf of a desingularization of X. As a consequence, we give a criterion as to when a T-variety has rational singularities. We also provide a condition for a T-variety to be Cohen¬Macaulay. As an application, we characterize quasihomogeneous elliptic singularities of surfaces
Liendo, Alvaro. "T-variétés affines : actions du groupe additif et singularités." Phd thesis, Université de Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00592274.
Повний текст джерелаTacheix, Thierry. "L'influence des variables financières sur l'emploi : France 1970-1988." Clermont-Ferrand 1, 1991. http://www.theses.fr/1991CLF10007.
Повний текст джерелаWilliams, Benjamin. "Efficience informationnelle et équilibre du marché boursier des actions : spéculation rationnelle et anomalies." Clermont-Ferrand 1, 1998. http://www.theses.fr/1998CLF10195.
Повний текст джерелаThe thesis treats the problem of the informational efficiency of developed countries' stock markets. In the first chapter, we analyse samuelson's equilibria, which have been used to test efficiency since the sixties. The results of these tests, applied to French and American stock markets, are presented in the second chapter. These tests show evidence against the joint hypothesis of informational efficiency and samuelson's equilibria. The third chapter reviews the literature explaining the anomalies, cited in chapter two, by the following models : equilibrium models of rational expectations versus informational inefficiency and irrationality. But none of these theories are fully satisfactory. Indeed, stock markets are informationally efficient but samuelson's model must be replaced by an equilibrium model which deals with rational speculators. The fourth chapter presents the general properties of rational speculation equilibria. In the fifth chapter, we show that this model entails the stylized facts described by the anomalies. Finally, in the sixth chapter, we show that our model can be applied to a particular stock market - the paris stock exchange - for which the joint hypothesis of informational efficiency and rational speculation equilibrium is not rejected
Boussicault, Adrien. "Action du groupe symétrique sur certaines fractions rationnelles ; suivi de Puissances paires du Vandermonde." Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00502471.
Повний текст джерелаBohn, Pierre. "Conception rationnelle, synthèse et évaluation préclinique de nouvelles molécules actives contre la maladie d'Alzheimer." INSA de Rouen, 2006. http://www.theses.fr/2006ISAM0006.
Повний текст джерелаMarty, Fabrice. "Action économique et adaptations rationnelles : gestion par les firmes agro-alimentaires d'un produit protége soumis a un règlement technique." Paris 10, 1998. http://www.theses.fr/1998PA100078.
Повний текст джерелаTorgeman, Mohamed. "Asymétrie d'information et évaluation d'actifs risques." Toulouse 1, 1997. http://www.theses.fr/1997TOU10046.
Повний текст джерелаThis thesis studies different aspects of financial market equilibrium when traders are diversely informed. Chapter 1 explores the informational efficiency in a fully revealing rational expectations equilibrium models. Using the work of Grossman (1978), we establish the direct link between strong efficiency in the sense of Gama (1970) and fully revealing equilibrium in a general framework without special assumptions on variables distribution, utility function or dimension of private information vector. We also extend our analysis of fully revealing rational expectations equilibrium to a dynamic context. Chapter 2 introduces a new approach to model noisy rational expectations equilibrium. Uncertainty, which prevents price from being fully revealing is not introduced by a random supply as it is proposed in the literature but by a constraint in investment opportunities. Chapter 3 focuses on the dynamic behaviour of stock index futures mispricing series. We develop a rational expectations general equilibrium model in line of Pfleiderer (1984) with competitive stock and futures markets. These two markets, disconnected by a clientele effect, are linked by particular traders called arbitrageurs. This work extends the static model of Holden (1995) to a multiperiod setting. In this context, the mispricing autocorrelation is decreasing with time to maturity. This result suggests, the presence of mean reversion in index futures mispricing. However, in contrast with explanation of Yadav-Pope (1995), we show that this phenomenon is not induced by arbitrageurs
Petitjean, Charlie. "Actions hyperboliques du groupe multiplicatif sur des variétés affines : espaces exotiques et structures locales." Thesis, Dijon, 2015. http://www.theses.fr/2015DIJOS009/document.
Повний текст джерелаThis thesis is devoted to the study of affine T-varieties using the Altmann-Hausen presentation. We are especially interested in the case of hyperbolic actions of the multiplicative group Gm. In the first part, exotic affine spaces are studied, that is, smooth contractible affine varieties, assuming in addition that they are endowed with a Gm-action. In particular, in the case of dimension 3, we reinterpret the construction of Koras-Russell threefolds in terms of polyhedral divisors andwe give constructions of smooth contractible affine varieties and in dimensionslarger than 3.In the second part we consider the property of G-uniform rationality for a G-variety. This means that every point of this variety there exists an open G-stable neighborhood, which is equivariantly somorphic to a G-stable open subset of the affine space. In particular we will exhibit Gm-varieties which are smooth and rational but not Gm-uniformly rational
Mailliot, Justine. "Étude structurale de l’histoneméthyltransférase « CARM1 » et de ses complexes biologiquement significatifs : des structures 3D vers la conception rationnelle de composés à action pharmacologique." Thesis, Strasbourg, 2013. http://www.theses.fr/2013STRAJ015/document.
Повний текст джерелаProtein arginine methyltransferases (PRMTs) are involved in several cellular mechanisms: transcription, RNA maturation and transport, translation, signal transduction, DNA replication and repair, and apoptosis. Different studies showed that deregulation of those mechanisms involving PRMTs can induce some cancers, making these enzymes new potential targets for chemotherapy. It is therefore crucial to understand the mode of action of PRMTs at the atomic scale, both at the fundamental level and for the development of new drugs. The studies described here focus on PRMT4/CARM1 and rely on structural studies by bio-crystallography, in order to understand the methylation mechanisms catalyzed by CARM1 and to discover specific inhibitors, but also on in vitro studies, to characterize the interaction between CARM1 and its substrates
Mailliot, Justine. "Étude structurale de l'histoneméthyltransférase " CARM1 " et de ses complexes biologiquement significatifs : des structures 3D vers la conception rationnelle de composés à action pharmacologique." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00986266.
Повний текст джерелаGuéniche, Alain. "Dérivation empirique du portefeuille optimal des investisseurs informés et test du MEDAF conditionnel." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAG017.
Повний текст джерелаRational expectation equilibrium (REE) models were considerably developed over the past 40 years. However, still relatively little has been done on their empirical applications, private signals being unobservable. We propose a new methodology, theoretically premised, to reconstitute these signals and thus perfectly infer all the information. This allows us to build the optimal informed investors’ portfolio and explore its properties through three studies. In the first paper, we show, based on a REE model, that the orders entered into the order book (supply) and the resulting equilibrium price constitute a sufficient statistic for the aggregate information set. We explain how to extract the information contained in these two data, using realized volumes (known with delay) as proxy for the supply, and to construct ex post the portfolio conditional on private information. We compare its performance with the optimal uninformed agents’ portfolio obtained ex ante from prices. In a second paper, we derive the optimal informed investors’ portfolio by investigating a different specification for the noise. Constituted in the first study by a supply exogenously provided by noise traders, we now consider that informed and uninformed investors trade amongst themselves. They are initially endowed with a random quantity of risky assets and have both risk-sharing and informational motives to trade rationally on the stock market. We demonstrate that we must use information-related volumes, determined with a measure of the probability of informed trades, instead of total volumes. Due to the constraints and complexity of this measure, we found that using total volumes constitutes the best choice, at least until a better measure is found. Finally, in a third study, we use the informed agents’ portfolio to test the conditional capital asset pricing model (CAPM), instead of a value-weighted stock index traditionally used as proxy for the market portfolio. We show that conditioning on private information allows estimating the real beta, as well as the market risk premium by isolating the information risk premium that an index is unable to distinguish
Laubie, Raphaëlle. "Les Déterminants de l’Action Collective en Ligne dans les Communautés Virtuelles de Patients : une Approche Multi-Méthodes." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLED036/document.
Повний текст джерелаOver the last few years, virtual patients’communities have been developing tremendously over the Internet. These Web 2.0 communities allow frequent interactions among patients, who can share health-related information within an interactive environment. While many agree on the opportunity represented by those communities for its users, we know very little about what determines patients’ online collective action, specifically on virtual communities as well as the fundamentals of online collective action in these virtual spaces. Accordingly, this doctoral work examines why patients interact with others and how they interact on topics related to their disease through these virtual communities. Drawing on the goal-directed behavior (MGB), the expectancy-value (EVT) theories, the field force theory, gift concepts and field interviews, we have developed a model for examining patients’ online interactions and identified gift-giving behaviors in the context of online collective action. A multi-method, qualitative and quantitative approaches, enables us to explore patients’ interactions and measures the determinants of online collective action on these virtual spaces. The qualitative analysis of 54 interviews conducted with patients, patient’s relatives, Health 2.0 professionals, doctors and caregivers allows refining the research model, which has then been tested through a survey handled with 269 patients, members of patient’s communities. This research contributes to IS research by increasing our knowledge regarding the individual dynamics and interactions that surround online patients’ communities