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Regularity properties of isometric immersions
Authors:Email author" target="_blank">Stefan?MüllerEmail author  Mohammad Reza?Pakzad
Institution:(1) Max Planck Institute for Mathematics in the Sciences, , Inselstr. 22–26 , D–04103 Leipzig, Germany;(2) Department of Mathematics, University of British Columbia, 1984 Mathematics Road, Vancouver, B.C., Canada, V6T 1Z2
Abstract:We show that an isometric immersion y from a two-dimensional domain S with C1,α boundary to ℝ3 which belongs to the critical Sobolev space W2,2 is C1 up to the boundary. More generally C1 regularity up to the boundary holds for all scalar functions VW2,2(S) which satisfy det ∇2V=0. If S has only Lipschitz boundary we show such V can be approximated in W2,2 by functions VkW1,∞W2,2 with det ∇2Vk=0.
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