Cette note fournit un contre-exemple à la positivité locale du déterminant jacobien des solutions de l’équation de conduction en dimension . On montre que le signe du déterminant ne peut pas être imposé par un choix a priori de données au bord dans dépendant seulement des bornes inférieure et supérieure de la conductivité, même localement. L’argument utilise une conductivité scalaire à deux phases construite par Briane, Milton & Nesi [11, 10].
This note provides a counter-example to the local positivity of the Jacobian determinant for solutions of the conductivity equation in dimension . It shows that the sign of the determinant cannot be imposed by an a priori choice of boundary data in depending only on the upper and lower bound of the conductivity, even locally. The argument uses a scalar two-phase conductivity constructed by Briane, Milton & Nesi [11, 10].
@article{JEP_2015__2__171_0, author = {Capdeboscq, Yves}, title = {On a counter-example to quantitative Jacobian bounds}, journal = {Journal de l'\'Ecole polytechnique - Math\'ematiques}, volume = {2}, year = {2015}, pages = {171-178}, doi = {10.5802/jep.21}, language = {en}, url = {http://dml.mathdoc.fr/item/JEP_2015__2__171_0} }
Capdeboscq, Yves. On a counter-example to quantitative Jacobian bounds. Journal de l'École polytechnique - Mathématiques, Tome 2 (2015) pp. 171-178. doi : 10.5802/jep.21. http://gdmltest.u-ga.fr/item/JEP_2015__2__171_0/
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