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Mostrando ítems 1-10 de 12
Artículo
A complete set of covariants of the four qubit system
(IOS Press, 2003)
We obtain a complete and minimal set of 170 generators for the algebra of SL(2, C )×4- covariants of a binary quadrilinear form. Interpreted in terms of a four qubit system, this describes in particular the algebraic ...
Artículo
Locally grid graphs: classification and Tutte uniqueness
(2003)
We define a locally grid graph as a graph in which the structure around each vertex is a 3×3 grid ⊞, the canonical examples being the toroidal grids Cp×Cq. The paper contains two main results. First, we give a complete ...
Artículo
Resultados recientes sobre mosaicos de Penrose
(Real Sociedad Matemática Española, 2003)
Artículo
On certain doubly non-uniformly and singular non-uniformly elliptic systems
(Elsevier, 2003-09)
We consider the steady state of the thermistor problem consisting of a coupled set of nonlinear elliptic equations governing the temperature and the electric potential. We study the existence of weak solutions under two ...
Artículo
Computation of centralizers in braid groups and Garside groups
(Consejo Superior de Investigaciones Científicas, 2003)
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] ...
Artículo
Isogroups and isosubgroups
(Real Academia de Ciencias Exactas, Físicas y Naturales, 2003)
The main goal of this paper is to give a mathematical foundation, serious and consistent, to some parts of Santilli’s isotheory. We study the isotopic liftings of groups and subgroups and we also deal with the differences ...
Artículo
On the uniqueness of weak solutions of the two-dimensional primitive equations
(Ohio University Press, 2003-01)
The uniqueness of weak solutions of the primitive equations with Dirichlet boundary conditions at the bottom is an open problem even in the two dimensional case. The aim of this paper is to prove the uniqueness of weak ...
Artículo
Conjugacy problem for braid groups and Garside groups
(Elsevier, 2003-08-01)
We present a new algorithm to solve the conjugacy problem in Artin braid groups, which is faster than the one presented by Birman, Ko and Lee. This algorithm can be applied not only to braid groups, but to all Garside ...
Artículo
An Entropy-correction free solver for non-homogeneous Shallow Water equations
(Dunod, 2003)
In this work we introduce an accurate solver for the Shallow Water equations with source terms. This scheme does not need any kind of entropy correction to avoid instabilities near critical points. The scheme also solves ...
Artículo
Estudio de la Isotopología de Tsagas-Sourlas-Santilli
(Hadronic Press, 2003)
Since his original proposal of 1978 to study Lie-isotopic and Lie-admissible liftings of conventional, local-differential Hamiltonian formulations of point particles, the physicist R. M. Santilli suggested the contribution ...