Universitat Autònoma de Barcelona

Universitat Autònoma de Barcelona 2 registres trobats  La cerca s'ha fet en 0.01 segons. 
1.
36 p, 1.9 MB On the existence of symmetric bicircular central configurations of the 3n-body problem / Corbera Subirana, Montserrat (Universitat de Vic - Universitat Central de Catalunya) ; Valls, Clàudia 1973- (Universidade de Lisboa. Instituto Superior Técnico. Departamento de Matemàtica)
In this paper, we consider central configurations of the planar 3n-body problem consisting of n masses at the vertices of a regular n-gon inscribed in a circle of radius r and 2n masses at the vertices of a second (not necessarily regular) concentric 2n-gon inscribed in a circle of radius ar which are symmetric in the sense that the set of positions of the 3n masses and the set of the corresponding masses are invariant under the action of a finite subgroup of O(2). [...]
2021 - 10.1007/s00332-021-09743-z
Journal of Nonlinear Science, Vol. 31, Issue 6 (December 2021) , art. 88  
2.
24 p, 407.3 KB Centers and limit cycles of vector fields defined on invariant spheres / Buzzi, Claudio (Universidade Estadual Paulista. Instituto de Biociências Letras e Ciências Exatas) ; Rodero, Ana Livia (Universidade Estadual Paulista. Instituto de Biociências Letras e Ciências Exatas) ; Torregrosa, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
The aim of this paper is the study of the center-focus and cyclicity problems inside the class X of 3-dimensional vector fields that admit a first integral that leaves invariant any sphere centered at the origin. [...]
2021 - 10.1007/s00332-021-09751-z
Journal of Nonlinear Science, Vol. 31, Issue 6 (December 2021) , art. 92  

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