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Mostrando ítems 21-30 de 39
Prym-Tyurin varieties via Hecke algebras
(WALTER DE GRUYTER & CO, 2009)
Let G denote a finite group and pi : Z -> Y a Galois covering of smooth projective curves with Galois group G. For every subgroup H of G there is a canonical action of the corresponding Hecke algebra Q[H\G/H] on the Jacobian ...
Sur l’existence du schéma en groupes fondamental
(2020-06-06)
Soient S un schéma de Dedekind, X un S-schéma connexe localement de type ni et
x 2 X(S) une section. L’objet du présent papier est d’établir l’existence du schéma en groupes
fondamental de X lorsque X est à bres réduites ...
The Kurosh Subgroup Theorem for profinite groups
(Universidade Federal de Minas GeraisBrasilICX - DEPARTAMENTO DE MATEMÁTICAPrograma de Pós-Graduação em MatemáticaUFMG, 2019-07-11)
A teoria de Bass-Serre para grafos abstratos foi inaugurada no livro ’Arbres, amalgames, SL2’ (’Trees’ na versão em inglês), escrito por Jean-Pierre Serre em colaboração com Hyman Bass (1977). A motivação original do Serre ...
Group actions on Jacobian varieties
(Universidad Autonoma de Madrid, 2007)
Consider a finite group G acting on a Riemann surface S, and the associated branched Galois cover πG : S → Y = S/G. We introduce the concept of geometric signature for the action of G, and we show that it captures much ...
Further Examples Of Maximal Curves Which Cannot Be Covered By The Hermitian Curve
(ELSEVIER SCIENCE BVAMSTERDAM, 2015)
Curves of large genus covered by the Hermitian curve
(Marcel Dekker IncNew YorkEUA, 2000)
The fundamental group of a Hopf linear category
(Elsevier Inc, 2016-09)
We define the fundamental group of a Hopf algebra over a field. For this purpose we first consider gradings of Hopf algebras and Galois coverings. The latter are given by linear categories with new additional structure ...
On the dynamics of n-circle inversion
(2019)
The article deals with singular perturbation of polynomial maps R-lambda,R- n(z) = z(n) + lambda/z, where lambda is a complex parameter and n is the degree, which is a particular case of the family of rational maps known ...
Real structures on marked Schottky space
(2018)
Marked Schottky space MSg is an explicit model of the quasiconformal deformation space of a Schottky group of rank g, this being isomorphic to the punctured unit disc for g=1 and, for g2, a connected complex manifold of ...