Heriot-Watt Mathematics Report Series
HWM99-69, 30 Jan 2000

Regularity of quasiconvex envelopes

J.M. Ball, B Kirchheim and J Kristensen


Abstract

We prove that the quasiconvex envelope of a differentiable function which satisfies natural growth conditions at infinity is a $C^{1}$ function. Without the growth conditions the result fails in general. We also obtain results on higher regularity (in the sense of $C^{1,\alpha}_{\rm loc}$) and similar results for other types of envelopes, including polyconvex and rank-$1$ convex envelopes.

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