Mazon J. Variational and Diffusion Problems in Random Walk Spaces 2023

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Mazon J. Variational and Diffusion Problems in Random Walk Spaces 2023

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Textbook in PDF format This book presents the latest developments in the theory of gradient flows in random walk spaces. A broad framework is established for a wide variety of partial differential equations on nonlocal models and weighted graphs. Within this framework, specific gradient flows that are studied include the heat flow, the total variational flow, and evolution problems of Leray-Lions type with different types of boundary conditions. With many timely applications, this book will serve as an invaluable addition to the literature in this active area of research. Variational and Diffusion Problems in Random Walk Spaces will be of interest to researchers at the interface between analysis, geometry, and probability, as well as to graduate students interested in exploring these areas. Preface Random Walks Markov Chains φ-Essential Irreducibility Random Walk Spaces Examples The Nonlocal Gradient, Divergence and Laplace Operators The Nonlocal Boundary, Perimeter and Mean Curvature Poincaré-Type Inequalities Global Poincaré-Type Inequalities Poincaré-Type Inequalities on Subsets The Heat Flow in Random Walk Spaces The m-Heat Flow Infinite Speed of Propagation Asymptotic Behaviour Ollivier-Ricci Curvature The Bakry-Émery Curvature-Dimension Condition Logarithmic-Sobolev Inequalities Transport Inequalities The m-Heat Content Probabilistic Interpretation The Spectral m-Heat Content The Total Variation Flow in Random Walk Spaces The m-Total Variation The m--Laplacian and m-The Total Variation Flow Asymptotic Behaviour m-Cheeger and m-Calibrable Sets The Eigenvalue Problem for - m Isoperimetric Inequality The m-Cheeger Constant The m-Cheeger Constant and the m-Eigenvalues of -m ROF-Models in Random Walk Spaces The m-ROF Model with L-Fidelity Term The Gradient Descent Method The m-ROF-Model with L-Fidelity Term The Geometric Problem Regularity of Solutions in Terms of the NonlocalCurvature Thresholding Parameters The Gradient Descent Method Least Gradient Functions in Random Walk Spaces The Nonlocal Least Gradient Problem Nonlocal Median Value Property Nonlocal Poincaré Inequality Doubly Nonlinear Nonlocal Stationary Problems of Leray-Lions Type with Nonlinear Boundary Conditions Nonlocal Diffusion Operators of Leray-Lions Type and Nonlocal Neumann Boundary Operators Nonlocal Stationary Problems with Neumann Boundary Conditions of Gunzburger-Lehoucq Type Existence of Solutions of an Approximate Problem Some Estimates on the Solutions of the Approximate Problems Monotonicity of the Solutions of the ApproximateProblems An Lp-Estimate for the Solutions of the Approximate Problems Proof of the Existence Result Neumann Boundary Conditions of Dipierro-Ros-Oton-Valdinoci Type Doubly Nonlinear Nonlocal Diffusion Problems of Leray-Lions Type with Nonlinear Boundary Conditions Evolution Problems with Neumann Boundary Conditions of Gunzburger-Lehoucq Type Nonlinear Dynamical Boundary Conditions The Evolution Problem for a Nonlocal Dirichlet-to-Neumann Operator Doubly Nonlinear Boundary Conditions Nonhomogeneous Boundary Conditions Evolution Problems Under Neumann Boundary Conditions of Dipierro-Ros-Oton-Valdinoci Type Nonlinear Semigroups Introduction Abstract Cauchy Problems Mild Solutions Accretive Operators Existence and Uniqueness Theorem Regularity of the Mild Solution Completely Accretive Operators Yosida Approximation of Maximal Monotone Graphs in RR Bibliography Index Index of notations