Published Paper

Inserted: 24 apr 2023
Last Updated: 12 jun 2024

Journal: Comptes Rendus - Série Mathématique
Volume: 362
Pages: 487-491
Year: 2024
Doi: 10.5802/crmath.558

Abstract:

We show that the lower-semicontinuous envelope of a non-convex double integral may not admit a representation as a double integral. By taking an integrand with value $+\infty$ except at three points (say −1, 0 and 1) we give a simple proof and an explicit formula for the relaxation that hopefully may shed some light on this type of problems. This is a simplified version of examples by Mora-Corral and Tellini, and Kreisbeck and Zappale, who characterize the lower-semicontinuous envelope via Young measures.