On irreducible algebras spanned by triangularizable matrices

On the Irreducible Characters of Hecke Algebras

Irreducible Positive Linear Maps on Operator Algebras

Motivated by the classical results of G. Frobenius and O. Perron on the spectral theory of square matrices with nonnegative real entries, D. Evans and R. Høegh-Krohn have studied the spectra of positive linear maps on general (noncommutative) matrix algebras. The notion of irreducibility for positive maps is required for the Frobenius theory of positive maps. In the present article, irreducible...

Subdirectly irreducible separable dynamic algebras

A characterization of the subdirectly irreducible separable dynamic algebras is presented. The notions developed for this study were also suitable to describe the previously found class of the simple separable dynamic algebras.

Subdirectly Irreducible Quasi-modal Algebras

In this paper we give suitable notions of congruences and subdirectly irreducible algebras for the class of quasi-modal algebras introduced in [1]. We also prove some characterizations of subdirectly irreducible algebras following the similar results given by G. Sambin [5] for modal algebras.

On the Ball Spanned by Balls

The procedure for linear programming in linear time in xed dimen sion is extended to solve in linear time certain nonlinear problems Examples are the problem of nding the smallest ball enclosing n given balls and the weighted center problem in xed dimension y IBM Almaden Research Center Harry Road San Jose California and School of Mathematical Sciences Tel Aviv University Tel Aviv Israel