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Some Rigidity Results Related to Monge–Ampère Functions

Published online by Cambridge University Press:  20 November 2018

Robert L. Jerrard
Robert L. Jerrard*
Affiliation:
Department of Mathematics, University of Toronto, Toronto, ON M5S 2E4, e-mail: [email protected]
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Abstract

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The space of Monge–Ampère functions, introduced by J. H. G. Fu, is a space of rather rough functions in which the map $u\,\mapsto \,\text{Det}\,{{\text{D}}^{2}}u$ is well defined and weakly continuous with respect to a natural notion of weak convergence. We prove a rigidity theorem for Lagrangian integral currents that allows us to extend the original definition of Monge–Ampère functions. We also prove that if a Monge–Ampère function $u$ on a bounded set $\Omega \,\subset \,{{\mathbb{R}}^{2}}$ satisfies the equation $\text{Det}\,{{D}^{2}}u\,=\,0$ in a particular weak sense, then the graph of $u$ is a developable surface, and moreover $u$ enjoys somewhat better regularity properties than an arbitrary Monge–Ampère function of 2 variables.

Keywords

49Q1553C24
Type
Research Article
Information
Canadian Journal of Mathematics , Volume 62 , Issue 2 , 01 April 2010 , pp. 320 - 354
Copyright
Copyright © Canadian Mathematical Society 2010

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