Noncommutative variations on Laplace’s equation

Rosenberg, Jonathan

doi:10.2140/apde.2008.1.95

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Noncommutative variations on Laplace's equation

Jonathan Rosenberg

Vol. 1 (2008), No. 1, 95–114

DOI: 10.2140/apde.2008.1.95

Abstract

As a first step toward developing a theory of noncommutative nonlinear elliptic partial differential equations, we analyze noncommutative analogues of Laplace’s equation and its variants (some of them nonlinear) over noncommutative tori. Along the way we prove noncommutative analogues of many results in classical analysis, such as Wiener’s Theorem on functions with absolutely convergent Fourier series, and standard existence and nonexistence theorems on elliptic functions. We show that many classical methods, including the maximum principle, the direct method of the calculus of variations, and the use of the Leray–Schauder Theorem, have analogues in the noncommutative setting.

Keywords

noncommutative geometry, irrational rotation algebra, elliptic partial differential equations, maximum principle, calculus of variations, harmonic maps, Leray–Schauder Theorem, meromorphic functions

Mathematical Subject Classification 2000

Primary: 58B34

Secondary: 58J05, 35J05, 35J20, 30D30, 46L87

Milestones

Received: 27 February 2008

Revised: 19 March 2008

Accepted: 14 July 2008

Published: 2 October 2008

Authors

Jonathan Rosenberg
Department of Mathematics University of Maryland College Park, MD 20742-4015 United States
http://www.math.umd.edu/~jmr

Vol. 1, No. 1, 2008