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8-01-2015, 20:39

Almgren's Big Regularity Paper

Category: E-Books

Almgren's Big Regularity Paper

Vladimir Scheffer, Jean E. Taylor, "Almgren's Big Regularity Paper: Q-valued Functions Minimizing Dirichlet's Integral and the Regularity of Area-minimizing Rectifiable Currents Up to"
2000 | ISBN-10: 9810241089 | 972 pages | PDF | 31 MB


Fred Almgren created the excess method for proving regularity theorems in the calculus of variations. His techniques yielded Holder continuity except for a small closed singular set. In the sixties and seventies Almgren refined and generalized his methods. Between 1974 and 1984 he wrote a 1,700-page proof that was his most ambitious exposition of his ground-breaking ideas. Originally, this monograph was available only as a three-volume work of limited circulation. The entire text is faithfully reproduced here.This book gives a complete proof of the interior regularity of an area-minimizing rectifiable current up to Hausdorff codimension 2. The argument uses the theory of Q-valued functions, which is developed in detail. For example, this work shows how first variation estimates from squash and squeeze deformations yield a monotonicity theorem for the normalized frequency of oscillation of a Q-valued function that minimizes a generalized Dirichlet integral. The principal features of the book include an extension theorem analogous to Kirszbraun's theorem and theorems on the approximation in mass of nearly flat mass-minimizing rectifiable currents by graphs and images of Lipschitz Q-valued functions.


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