On s’intéresse dans cette thèse aux ensembles minimaux.
Dans la première partie on étudie les cônes minimaux au sens d’Almgren de dimension dans , ce qui est une première étape obligée et utile dans l’étude des ensembles minimaux. La minimalité au sens d'Almgren de l'union de deux plans presque orthogonaux est établie. La méthode est généralisée pour montrer que l'union presque orthogonale de plusieurs plans ou hyperplans, et l'union presque orthogonale d'un plan et un sont minimales.
Dans la seconde partie on introduit une définition de minimiseur topologique, qui généralise celle de minimiseur de Mumford-Shah. On montrera des propriétés des minimiseurs topologiques, et fera un premier pas dans la direction d'une caractérisation des minimiseurs topologiques. On restreindra aussi la classe potentielle des Almgren-minimiseurs de qui ne seraient pas des cônes.
In the thesis we discuss the theory of minimal sets.
In the first part we study -dimensional Almgren minimal cones in , which is the first useful and necessary step to study Almgren minimal sets. We establish the Almgren minimality of the union of a pair of almost orthogonal planes in . The method is also generalized to prove the minimality of the almost orthogonal union of several planes or hyperplanes, as well as the almost orthogonal union of a plane and a in .
In the second part we introduce a definition of topological minimal sets, which is a generalization of that of Mumford-Shah-minimal sets. We prove some properties of topological minimal sets, and make a first step towards a characterisation of topological minimal sets. We restrict also the potential class of those Almgren minimal sets in which are not cones.
@phdthesis{BJHTUP11_2010__0808__P0_0, author = {Liang, Xiangyu}, title = {Ensembles et c\^ones minimaux de dimension $2$ dans les espaces euclidiens}, series = {Th\`eses d'Orsay}, publisher = {Universit\'e Paris-Sud 11 Facult\'e des Sciences d'Orsay}, number = {808}, year = {2010}, language = {fr}, url = {http://www.numdam.org/item/BJHTUP11_2010__0808__P0_0/} }
TY - BOOK AU - Liang, Xiangyu TI - Ensembles et cônes minimaux de dimension $2$ dans les espaces euclidiens T3 - Thèses d'Orsay PY - 2010 IS - 808 PB - Université Paris-Sud 11 Faculté des Sciences d'Orsay UR - http://www.numdam.org/item/BJHTUP11_2010__0808__P0_0/ LA - fr ID - BJHTUP11_2010__0808__P0_0 ER -
Liang, Xiangyu. Ensembles et cônes minimaux de dimension $2$ dans les espaces euclidiens. Thèses d'Orsay, no. 808 (2010), 201 p. http://numdam.org/item/BJHTUP11_2010__0808__P0_0/
Sommaire
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