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Isoperimetric Inequalities in Unbounded Convex Bodies
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Hamiltonian Perturbation Theory for Ultra-Differentiable Functions
Some scales of spaces of ultra-differentiable functions are introduced, having good stability properties with respect to infinitely many derivatives and compositions. They are well-suited for solving non-linear functional equations by means of hard implicit function theorems. They comprise Gevrey functions and thus, as a limiting case, analytic functions. Using majorizing series, we manage to characterize them in terms of a real sequence M bounding the growth of derivatives. In this functional setting, we prove two fundamental results of Hamiltonian perturbation theory: the invariant torus theorem, where the invariant torus remains ultra-differentiable under the assumption that its frequency...
Hamiltonian Systems
A selection of results, spanning a broad spectrum of disciplines, from the MSRI program on Hamiltonian Systems during Fall 2018.
Non-Semisimple Extended Topological Quantum Field Theories
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Naturality and Mapping Class Groups in Heegard Floer Homology
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Ergodicity of Markov Processes via Nonstandard Analysis
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