In this paper we study an algorithm for approximating fixed points using simplicial subdivisions of the simplex. Furthermore, it is compared with algorithms of primitive sets.

We obtain the formulae of covariances between random, introducing the Kronecker’s products: asymmetrical and antisymmetrical.

We consider the Hill equation whose potential is the formal derivative of a Hölder – continuous function of parameter \theta \in (0,1), and show that solutions of the discrete version converge to solutions of the original ...

We develop and study a generalization to multivariate functions of the notion of increment, by mean of we can reproduce in several variables, many importants theorems of the Calculus in one variable. In particular, it is ...

Using W. Rudin’s method it is shown that the tauberian theorem can be generalized to several kernels other than the Poisson kernel. We also proof an inverse of the tauberian theorem, that is, an abelian theorem.

A family of functions, which share many properties with the classical partition function p(n), is studied. It is explained why these functions may be called “partition functions” and, in particular, some recursive formulas ...

In this article we give some geometrical interpretations of the Schubert-varieties of the Grassmannians G(2,4),G(3,5) and G(2, 5), and some of their applications to enumerative geometry.

En este artículo se estudian los triángulos casi congruentes, que consisten en las parejas de triángulos que tienen exactamente 5 de sus 6 elementos congruentes. Se caracterizan todas las soluciones enteras a este problema. ...

The problem of convergence, as t ® +¥ , of solutions of the system (1) is considered. It is assumed that the functions a , f and g are of class C1 for all values of their arguments, furtermore g' (x) > 0 , f ' (x) ³ r > ...

Se estudian tres algoritmos de reducción para bigráficas diferenciales: regularización, eliminación de objetos y reducción de una flecha. En cada caso se determina la bigráfica resultante y la relación entre las respectivas ...