We study the scalar electrodynamics (S Q E D (4)) and the spinor electrodynamics (Q E D (4)) in the null-plane formalism. We follow Dirac's technique for constrained systems to analyze the constraint structure in both ...

In this article, we study the existence and uniqueness of outgoing solutions for the Helmholtz equation in locally perturbed half-planes with passive boundary. We establish an explicit outgoing radiation condition which ...

It is shown that the finite-dimensional simple representations of the superJordan plane B are one-dimensional. The indecomposable representations of dimension 2 and 3 of B are classified. Two families of indecomposable ...

In this paper we apply the time dependent Ginzburg-Landau (TDGL) equations to the study of thin superconducting films of variable surfaces in the presence of an external applied magnetic field We have made a systematic ...

In this paper we apply the time dependent Ginzburg-Landau (TDGL) equations to the study of thin superconducting films of variable surfaces in the presence of an external applied magnetic field We have made a systematic ...

Presentación de los programas y planes de desarrollo económico y social a efectuar por el Departamento Nacional de Planeación.

Este documento presenta una introducción al estudio de los planes de desarrollo para Colombia, en él se discuten temas de infraestructura física, infraestructura social, economía dual y problema agrario, demanda interna, ...