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Desingularization of Nilpotent Singularities in Families of Planar Vector Fields
  • Language: en
  • Pages: 122

Desingularization of Nilpotent Singularities in Families of Planar Vector Fields

This work aims to prove a desingularization theorem for analytic families of two-dimensional vector fields, under the hypothesis that all its singularities have a non-vanishing first jet. Application to problems of singular perturbations and finite cyclicity are discussed in the last chapter.

Limit Theorems for Null Recurrent Markov Processes
  • Language: en
  • Pages: 105
Derived $\ell $-Adic Categories for Algebraic Stacks
  • Language: en
  • Pages: 110

Derived $\ell $-Adic Categories for Algebraic Stacks

This text is intended for graduate students and research mathematicians interested in algebraic geometry, category theory and homological algebra.

Topological Invariants of the Complement to Arrangements of Rational Plane Curves
  • Language: en
  • Pages: 97

Topological Invariants of the Complement to Arrangements of Rational Plane Curves

The authors analyse two topological invariants of an embedding of an arrangement of rational plane curves in the projective complex plane, namely, the cohomology ring of the complement and the characteristic varieties. Their main result states that the cohomology ring of the complement to a rational arrangement is generated by logarithmic 1 and 2-forms and its structure depends on a finite number of invariants of the curve (its combinatorial type).

Classification and Probabilistic Representation of the Positive Solutions of a Semilinear Elliptic Equation
  • Language: en
  • Pages: 146

Classification and Probabilistic Representation of the Positive Solutions of a Semilinear Elliptic Equation

Concerned with the nonnegative solutions of $\Delta u = u^2$ in a bounded and smooth domain in $\mathbb{R}^d$, this title intends to prove that they are uniquely determined by their fine trace on the boundary as defined in [DK98a], answering a major open question of [Dy02].

The Rational Function Analogue of a Question of Schur and Exceptionality of Permutation Representations
  • Language: en
  • Pages: 96

The Rational Function Analogue of a Question of Schur and Exceptionality of Permutation Representations

Investigates the analogous question for rational functions. This book describes the Galois theoretic translation, based on Chebotarev's density theorem, leads to a certain property of permutation groups, called exceptionality.

Quasianalytic Monogenic Solutions of a Cohomological Equation
  • Language: en
  • Pages: 98

Quasianalytic Monogenic Solutions of a Cohomological Equation

We prove that the solutions of a cohomological equation of complex dimension one and in the analytic category have a monogenic dependence on the parameter. This cohomological equation is the standard linearized conjugacy equation for germs of holomorphic maps in a neighborhood of a fixed point.

Abstract Band Method via Factorization, Positive and Band Extensions of Multivariable Almost Periodic Matrix Functions, and Spectral Estimation
  • Language: en
  • Pages: 87

Abstract Band Method via Factorization, Positive and Band Extensions of Multivariable Almost Periodic Matrix Functions, and Spectral Estimation

In this work, versions of an abstract scheme are developed, which are designed to provide a framework for solving a variety of extension problems. The abstract scheme is commonly known as the band method. The main feature of the new versions is that they express directly the conditions for existence of positive band extensions in terms of abstract factorizations (with certain additional properties). The results prove, amongst other things, that the band extension is continuous in an appropriate sense.

Anisotropic Hardy Spaces and Wavelets
  • Language: en
  • Pages: 136

Anisotropic Hardy Spaces and Wavelets

Investigates the anisotropic Hardy spaces associated with very general discrete groups of dilations. This book includes the classical isotropic Hardy space theory of Fefferman and Stein and parabolic Hardy space theory of Calderon and Torchinsky.

Yang-Mills Measure on Compact Surfaces
  • Language: en
  • Pages: 144

Yang-Mills Measure on Compact Surfaces

In this memoir we present a new construction and new properties of the Yang-Mills measure in two dimensions. This measure was first introduced for the needs of quantum field theory and can be described informally as a probability measure on the space of connections modulo gauge transformations on a principal bundle. We consider the case of a bundle over a compact orientable surface. Our construction is based on the discrete Yang-Mills theory of which we give a full acount. We are able to take its continuum limit and to define a pathwise multiplicative process of random holonomy indexed by the class of piecewise embedded loops. We study in detail the links between this process and a white noise and prove a result of asymptotic independence in the case of a semi-simple structure group. We also investigate global Markovian properties of the measure related to the surgery of surfaces.