Browsing Artículos (Álgebra) by Title
Now showing items 85104 of 211

HasseSchmidt derivations and coefficient fields in positive characteristics [Article]
(Elsevier, 20030701)We show how to express any HasseSchmidt derivation of an algebra in terms of a finite number of them under natural hypothesis. As an application, we obtain coefficient fields of the completion of a regular local ring of ...

HasseSchmidt derivations, divided powers and differential smoothness [Article]
(Association des Annales de l'Institut Fourier, 2009)Let k be a commutative ring, A a commutative kalgebra and D the filtered ring of klinear differential operators of A. We prove that: (1) The graded ring gr D admits a canonical embedding θ into the graded dual of the ...

Hironaka's characteristic polygon and effective resolution of surfaces [Article]
(Elsevier, 20070301)Hironaka’s concept of characteristic polyhedron of a singularity has been one of the most powerful and fruitful ideas of the last decades in singularity theory. In fact, since then combinatorics have become a major tool ...

Homotopy theory of bicomplexes [Article]
(Elsevier, 201905)We define two model structures on the category of bicomplexes concentrated in the right half plane. The first model structure has weak equivalences detected by the totalisation functor. The second model structure’s weak ...

Homotopy theory of nonsymmetric operads, II: Change of base category and left properness [Article]
(Mathematical Sciences Publishers, 2014)We prove, under mild assumptions, that a Quillen equivalence between symmetric monoidal model categories gives rise to a Quillen equivalence between their model categories of (nonsymmetric) operads, and also between model ...

Homotopy theory of nonsymmetric operads [Article]
(Mathematical Sciences Publishers, 2011)We endow categories of nonsymmetric operads with natural model structures. We work with no restriction on our operads and only assume the usual hypotheses for model categories with a symmetric monoidal structure. We also ...

Homotopy units in Ainfinity algebras [Article]
(American Mathematical Society, 201603)We show that the canonical map from the associative operad to the unital associative operad is a homotopy epimorphism for a wide class of symmetric monoidal model categories. As a consequence, the space of unital associative ...

How to calculate the slopes of a Dmodule [Article]
(Foundation Compositio Mathematica, 1996) 
Improvements of the Weil bound for ArtinSchreier curves [Article]
(Springer, 201110)For the ArtinSchreier curve y q − y = f(x) defined over a finite field Fq of q elements, the celebrated Weil bound for the number of Fq r rational points can be sharp, especially in supersingular cases and when r is ...

Improving an algorithm to solve multiple simultaneous conjugacy problems in braid groups [Article]
(American Mathematical Society, 2005)There are recent cryptographic protocols that are based on Multiple Simultaneous Conjugacy Problems in braid groups. We improve an algorithm, due to Sang Jin Lee and Eonkyung Lee, to solve these problems, by applying a ...

Inequalities between Littlewood–Richardson coefficients [Article]
(Elsevier, 200605)We prove that a conjecture of Fomin, Fulton, Li, and Poon, associated to ordered pairs of partitions, holds for many infinite families of such pairs. We also show that the bounded height case can be reduced to checking ...

Integral points in rational polygons: a numerical semigroup approach [Article]
(Springer, 2016)In this paper we use an elementary approach by using numerical semigroups (specifically, those with two generators) to give a formula for the number of integral points inside a rightangled triangle with rational ...

Invariants and coinvariants of the symmetric group in noncommuting variables [Article]
(University of Toronto Press, 2008)We introduce a natural Hopf algebra structure on the space of noncommutative symmetric functions. The bases for this algebra are indexed by set partitions. We show that there exists a natural inclusion of the Hopf algebra ...

Irregular hypergeometric Dmodules [Article]
(E, 20100801)We study the irregularity of hypergeometric Dmodules MA(β) via the explicit construction of Gevrey series solutions along coordinate subspaces in X = C n. As a consequence, we prove that along coordinate hyperplanes the ...

Irregular modified AHypergeometric systems [Article]
(American Mathematical Society, 2015)A modified Ahypergeometric system is a system of differential equations for the function f(t w · x) where f(y) is a solution of an Ahypergeometric system in n variables and w is an n dimensional integer vector, which is ...

Ktheory of derivators revisited [Article]
(Mathematical Sciences Publishers, 2017)We define a Ktheory for pointed right derivators and show that it agrees with Waldhausen Ktheory in the case where the derivator arises from a good Waldhausen category. This Ktheory is not invariant under general ...

KatzRadon transform of ladic representations [Article]
(Duke University Press, 2012)We prove a simple explicit formula for the local KatzRadon transform of an ladic representation of the Galois group of the fraction field of a strictly henselian discrete valuation ring with positive residual characteristic, ...

Lfunctions of symmetric powers of the generalized Airy family of exponential sums [Article]
(201112)This paper looks at the Lfunction of the kth symmetric power of the sheaf Aif over the affine line associated to the generalized Airy family of exponential sums. Using ℓadic techniques, we compute the degree of this ...

La labor docente del profesor de matemáticas [Article]
(Sociedad Española de Matemática Aplicada, 2003) 
Large Galois images for Jacobian varieties of genus 3 curves [Article]
(Polish Academy of Sciences, Institute of Mathematics, 2016)Given a prime number ℓ ≥ 5, we construct an infinite family of threedimensional abelian varieties over Q such that, for any A/Q in the family, the Galois representation ρA,ℓ : GQ → GSp6 (Fℓ) attached to the ℓtorsion of ...