TEXTOS DE MATEMÁTICA

SÉRIE B - N. 19

 

CONTENTS

 

The work of Graciano de Oliveira

J. A. Perdigão Dias da Silva  1

 

Some formulae for GL(n,q)

James A. Green  5

 

Symmetric groups and related algebras

Gordon James  13

 

Realizing matrices in the nonnegative inverse eigenvalue problem

Thomas J. Laffey  21

 

Groups generated by their elements of a fixed finite order

Matjaz Omladi c  33

 

Invariant subspaces and matrix completion problems

Ion Zaballa  43

 

Zn-quasi algebras

Helena Albuquerque and Shahn Majid  57

 

Irreducible characters of finite algebra groups

Carlos A. M. André  65

 

Littlewood-Richardson fillings and their symmetries

Olga Azenhas  81

 

PSD matrices in statistical mechanics

Natália Bebiano  93

 

On extremal c-convertible subspaces

M. Purificação Coelho and M. Antónia Duffner  101

 

A note on the unification of min-max and interlacing theorems

Laura Iglésias and Fernando C. Silva  105

 

The role of representation theory in the Oliveira-Marcus conjecture

Alexander Kovacec  111

 

Galois representations and Hilbert's Theorem 90

António Machiavelo  119

 

On the additive version of the rigidity problem for linear representations of a free group

Orlando Neto and Fernando C. Silva  125