Mostrando ítems 1-10 de 209
Fast Nielsen-Thurston classification of braids [Artículo]
(Mathematical Sciences Publishers, 2014)
We prove the existence of an algorithm that solves the reducibility problem in braid groups and runs in quadratic time with respect to the braid length for any fixed braid index.
Fast algorithmic Nielsen-Thurston classification of four-strand braids [Artículo]
(World Scientific Publishing, 2012-04)
We give an algorithm which decides the Nielsen-Thurston type of a given four-strand braid. The complexity of our algorithm is quadratic with respect to word length. The proof of its validity is based on a result which ...
On a determinantal formula of Tadić [Artículo]
(Johns Hopkins University Press, 2014-02)
We study a special class of irreducible representations of GLn over a local non-Archimedean field which we call ladder representations. This is a natural class in the admissible dual which contains the Speh representations. ...
Semblanza del profesor don Gonzalo Sánchez Vázquez [Artículo]
(Federación Española de Profesores de Matemáticas, 1997-06)
Logarithmic differential operators and logarithmic de Rham complexes relative to a free divisor [Artículo]
We prove a structure theorem for differential operators in the 0-th term of the V-filtration relative to a free divisor. manifold. As an application, we give a formula for the logarithmic de Rham complex with respect to a ...
The module Dfs for locally quasi-homogeneous free divisors [Artículo]
We find explicit free resolutions for the D-modules Dfs and D[s]fs/D[s]f s+1, where f is a reduced equation of a locally quasi-homogeneous free divisor. These results are based on the fact that every locally quasi-homogeneous ...
Irregular modified A-Hypergeometric systems [Artículo]
(American Mathematical Society, 2015)
A modified A-hypergeometric system is a system of differential equations for the function f(t w · x) where f(y) is a solution of an A-hypergeometric system in n variables and w is an n dimensional integer vector, which is ...
On irregular binomial D-modules [Artículo]
We prove that a holonomic binomial D–module MA(I, β) is regular if and only if certain associated primes of I determined by the parameter vector β ∈ Cd are homogeneous. We further describe the slopes of MA(I, β) along a ...
On the modules of m-integrable derivations in non-zero characteristic [Artículo]
Let k be a commutative ring and A a commutative k-algebra. Given a positive integer m, or m = ∞, we say that a k-linear derivation δ of A is m-integrable if it extends up to a Hasse–Schmidt derivation D = (Id, D1 = δ, ...
Ordering pure braid groups on compact, connected surfaces [Artículo]
(University of California, 2002-04)
We prove that the pure braid groups on compact, connected, orientable surfaces are bi-orderable, and that the pure braid groups on compact, connected non-orientable surfaces have generalized torsion, thus they are not ...