On uniqueness of automorphisms groups of Riemann surfaces.
R. A. Hidalgo, M. A. Leyton (2007)
Revista Matemática Iberoamericana
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R. A. Hidalgo, M. A. Leyton (2007)
Revista Matemática Iberoamericana
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Nuno Franco, Juan González-Meneses (2003)
Revista Matemática Iberoamericana
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We give a new method to compute the centralizer of an element in Artin braid groups and, more generally, in Garside groups. This method, together with the solution of the conjugacy problem given by the authors in [9], are two main steps for solving conjugacy systems, thus breaking recently discovered cryptosystems based in braid groups [2]. We also present the result of our computations, where we notice that our algorithm yields surprisingly small generating sets for the centralizers. ...
A. Ballester-Bolinches, R. Esteban-Romero (2007)
Revista Matemática Iberoamericana
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P. Juutinen, G. Lu, J. J. Manfredi, B. Stroffolini (2007)
Revista Matemática Iberoamericana
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Rubén A. Hidalgo (2004)
Revista Matemática Iberoamericana
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Let S be a real closed Riemann surfaces together a reflection τ : S ---> S, that is, an anticonformal involution with fixed points. A well known fact due to C. L. May asserts that the group K(S, τ), consisting on all automorphisms ...
P. Cameron, J. Cilleruelo, O. Serra (2007)
Revista Matemática Iberoamericana
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M. Cárdenas, F.F. Lasheras, A. Quintero, D. Repovs (2009)
Revista Matemática Iberoamericana
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Gert-Martin Greuel (2003)
Revista Matemática Iberoamericana
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We report on a partial solution of the conjecture that the class of finite solvable groups can be characterised by 2-variable identities. The proof requires pieces from number theory, algebraic geometry, singularity theory and computer algebra. The computations were carried out using the computer algebra system SINGULAR.
Yahya Ould Hamidoune, Alain Plagne (2005)
Revista Matemática Iberoamericana
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