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Classical and Multilinear Harmonic Analysis
This contemporary graduate-level text in harmonic analysis introduces the reader to a wide array of analytical results and techniques.
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A Course in Complex Analysis and Riemann Surfaces
Complex analysis is a cornerstone of mathematics, making it an essential element of any area of study in graduate mathematics. Schlag's treatment of the subject emphasizes the intuitive geometric underpinnings of elementary complex analysis that naturally lead to the theory of Riemann surfaces. The book begins with an exposition of the basic theory of holomorphic functions of one complex variable. The first two chapters constitute a fairly rapid, but comprehensive course in complex analysis. The third chapter is devoted to the study of harmonic functions on the disk and the half-plane, with an emphasis on the Dirichlet problem. Starting with the fourth chapter, the theory of Riemann surfaces...
Classical and Multilinear Harmonic Analysis
This contemporary graduate-level text in harmonic analysis introduces the reader to a wide array of analytical results and techniques.
Nonsmooth Differential Geometry-An Approach Tailored for Spaces with Ricci Curvature Bounded from Below
The author discusses in which sense general metric measure spaces possess a first order differential structure. Building on this, spaces with Ricci curvature bounded from below a second order calculus can be developed, permitting the author to define Hessian, covariant/exterior derivatives and Ricci curvature.
You Can't Copy Tradition
The horrors of World War I left a mark on all of Europe as well as on the United States of America. Within the political, intellectual and academic life the catchphrase of international good will established itself. This term, rather this vision, must not be ignored in the context of the birth hour of the Austro-American Institute of Education, when international education was still in its infancy. The institute ́s founder, Paul Leo Dengler, seized an opportunity presented to him at the end of 1925 – apparently just in time amidst the pioneering spirit following World War I – to propose and present his Amerika-Institut in Vienna to leaders of the Institute of International Education in New York. Eventually, in March of 1926 the Austro-American Institute of Education (AAIE) was founded in Vienna. The idea of a comprehensive history of the AAIE is to shed light on the evolvement of some of the most significant intellectual forces that have been shaping international cultural relations over the past century. Volume I of AAIE ́s history takes a close look at the activities, programs, key-players and the bilateral mission of Dengler‘s institute during the years 1926 –1971.
Invariant Manifolds and Dispersive Hamiltonian Evolution Equations
The notion of an invariant manifold arises naturally in the asymptotic stability analysis of stationary or standing wave solutions of unstable dispersive Hamiltonian evolution equations such as the focusing semilinear Klein-Gordon and Schrodinger equations. This is due to the fact that the linearized operators about such special solutions typically exhibit negative eigenvalues (a single one for the ground state), which lead to exponential instability of the linearized flow and allows for ideas from hyperbolic dynamics to enter. One of the main results proved here for energy subcritical equations is that the center-stable manifold associated with the ground state appears as a hyper-surface wh...
Hypercontractivity in Group von Neumann Algebras
In this paper, the authors provide a combinatorial/numerical method to establish new hypercontractivity estimates in group von Neumann algebras. They illustrate their method with free groups, triangular groups and finite cyclic groups, for which they obtain optimal time hypercontractive inequalities with respect to the Markov process given by the word length and with an even integer. Interpolation and differentiation also yield general hypercontrativity for via logarithmic Sobolev inequalities. The authors' method admits further applications to other discrete groups without small loops as far as the numerical part—which varies from one group to another—is implemented and tested on a comp...
Needle Decompositions in Riemannian Geometry
The localization technique from convex geometry is generalized to the setting of Riemannian manifolds whose Ricci curvature is bounded from below. In a nutshell, the author's method is based on the following observation: When the Ricci curvature is non-negative, log-concave measures are obtained when conditioning the Riemannian volume measure with respect to a geodesic foliation that is orthogonal to the level sets of a Lipschitz function. The Monge mass transfer problem plays an important role in the author's analysis.
Global Regularity for 2D Water Waves with Surface Tension
The authors consider the full irrotational water waves system with surface tension and no gravity in dimension two (the capillary waves system), and prove global regularity and modified scattering for suitably small and localized perturbations of a flat interface. An important point of the authors' analysis is to develop a sufficiently robust method (the “quasilinear I-method”) which allows the authors to deal with strong singularities arising from time resonances in the applications of the normal form method (the so-called “division problem”). As a result, they are able to consider a suitable class of perturbations with finite energy, but no other momentum conditions. Part of the authors' analysis relies on a new treatment of the Dirichlet-Neumann operator in dimension two which is of independent interest. As a consequence, the results in this paper are self-contained.
