[Un contre-exemple simplifié à la représentation intégrale de la relaxation des intégrales doubles]
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 except at three points (say , and ) 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.
Nous montrons que l’enveloppe semi-continue inférieure d’une intégrale double non convexe peut ne pas admettre de représentation sous forme d’intégrale double. En prenant un intégrande avec une valeur infinie sauf en trois points (disons -1, 0 et 1), nous donnons une preuve simple et une formule explicite pour la relaxation qui, espérons-le, pourra éclairer ce type de problèmes. Ceci est une version simplifiée des exemples de Mora-Corral et Tellini, et de Kreisbeck et Zappale, qui caractérisent l’enveloppe semi-continue inférieure via les mesures de Young.
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Braides, Andrea  1
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@article{CRMATH_2024__362_G5_487_0,
author = {Braides, Andrea},
title = {A simplified counterexample to the integral representation of the relaxation of double integrals},
journal = {Comptes Rendus. Math\'ematique},
pages = {487--491},
year = {2024},
publisher = {Acad\'emie des sciences, Paris},
volume = {362},
number = {G5},
doi = {10.5802/crmath.558},
language = {en},
url = {https://www.numdam.org/articles/10.5802/crmath.558/}
}
TY - JOUR AU - Braides, Andrea TI - A simplified counterexample to the integral representation of the relaxation of double integrals JO - Comptes Rendus. Mathématique PY - 2024 SP - 487 EP - 491 VL - 362 IS - G5 PB - Académie des sciences, Paris UR - https://www.numdam.org/articles/10.5802/crmath.558/ DO - 10.5802/crmath.558 LA - en ID - CRMATH_2024__362_G5_487_0 ER -
%0 Journal Article %A Braides, Andrea %T A simplified counterexample to the integral representation of the relaxation of double integrals %J Comptes Rendus. Mathématique %D 2024 %P 487-491 %V 362 %N G5 %I Académie des sciences, Paris %U https://www.numdam.org/articles/10.5802/crmath.558/ %R 10.5802/crmath.558 %G en %F CRMATH_2024__362_G5_487_0
Braides, Andrea. A simplified counterexample to the integral representation of the relaxation of double integrals. Comptes Rendus. Mathématique, Tome 362 (2024) no. G5, pp. 487-491. doi: 10.5802/crmath.558
[1] Lower semicontinuity and relaxation via Young measures for nonlocal variational problems and applications to peridynamics, SIAM J. Math. Anal., Volume 50 (2018), pp. 779-809 | DOI | Zbl | MR
[2] On the lower semicontinuity of certain integral functionals, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat., Volume 74 (1983), pp. 274-282 | Zbl | MR
[3] Loss of double-integral character during relaxation, SIAM J. Math. Anal., Volume 53 (2021), pp. 351-385 | DOI | Zbl | MR
[4] Relaxation of a scalar nonlocal variational problem with a double-well potential, Calc. Var. Partial Differ. Equ., Volume 59 (2020), 67, 57, 30 pages | DOI | Zbl | MR
[5] Weak lower semicontinuity and relaxation for a class of non-local functionals, Rev. Mat. Complut., Volume 29 (2016), pp. 485-495 | DOI | Zbl | MR
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