Let be a N-dimensional smooth manifold. Consider a locally integrable structure L of CT with fiber dimension 1 &#8804; n < N and set m = N &#8722; n. We say that L is locally integrable if, for every p &#8712; , there ...

In this work we study group gradings on the upper triangular matrices algebra UTn(F), which have several applications in the PI-algebra theory. Our main purpose is to exhibit a description of all _nite gradings of UTn(F) ...

The objective of this work is to detail and to analyze consequences of a recent paper of P. Pergher, which deals with the construction of an indexhomomorphism associated to spaces equipped with free actions of the cyclic ...

The aim in this work is to estudy the existence and certain qualitative properties of travellingwave to the Korteweg-de Vries-Burgers (KdVB) equation. The asymptotic behaviour of these waves is analysed when &#949; &#8595; ...

In this work we present a construction of classifying spaces for principal bundles by studying simplicial and co-simplicial objects over a category and as application we present the construction of Eilenberg-MacLane ...

In this work we present fundamental theory to establish the coordinates of the Kronecker Index, Cup and Cap Products in the finite Simplicial Complexes category in terms of chain and cochain.

In this work, we study the global existence of smooth solutions for certain systems of the form ut + f(u)x = Duxx, where u and f are vectors and D is a positive, constant and diagonalizable matrix. We assume that the ...

In this work we study a reaction-difusion problem with nonlinear Neumann boundary condition. The objective is to present suficient conditions on the diffusion coeficient so that the problem has an stable nonconstant ...

In this work we develop the transformation theory for isothermic surfaces in Euclidean space IR3 due to Darboux and Bianchi. As a consequence, we describe a method for constructing new solutions of the nonlinear system of ...

In this work, we present necessary and suficient conditions for that an operator of Calderón-Zygmund type can be extended to a bounded operator on L2. By using results of interpolation and cancellation conditions on the ...