On low rank perturbations of complex matrices and some discrete metric spaces.
On matrices having an invariant cone
On matrices of cofactors - II
On matrices with all minors negative.
On Matricial Norms Subordinate to Vectorial Norms.
On matrix convexity of the Moore-Penrose inverse.
On matrix groups defined by certain polynomial identities
On Matrix Norms and Logarithmic Norms.
On means of positive definite matrices
On melancholic magic squares
Starting with Dürer's magic square which appears in the well-known copper plate engraving Melencolia we consider the class of melancholic magic squares. Each member of this class exhibits the same 86 patterns of Dürer's magic square and is magic again. Special attention is paid to the eigenstructure of melancholic magic squares, their group inverse and their Moore-Penrose inverse. It is seen how the patterns of the original Dürer square to a large extent are passed down also to the inverses of the...
On Minimal Gerschgorin Sets for Families of Norms.
On minimal norms on .
On minimal rank over finite fields.
On mixed-type reverse-order laws for the Moore-Penrose inverse of a matrix product.
On Moore-Penrose Inverse of Block Matrices and Full-rank Factorization
On Multiples of Round and Pister Forms.
On Nambu bracket representations of 3-algebras.
On Neighbouring Matrices with Quadratic Elementary Divisors.
On Nilpotent Subsemigroups in some Matrix Semigroups
2000 Mathematics Subject Classification: 20M20, 20M10.We describe maximal nilpotent subsemigroups of a given nilpotency class in the semigroup Ωn of all n × n real matrices with non-negative coefficients and the semigroup Dn of all doubly stochastic real matrices.
On nonnegative matrices with given row and column sums.