On the star partial ordering of normal matrices.
On the structure of positive maps between matrix algebras
The structure of the set of positive unital maps between M₂(ℂ) and Mₙ(ℂ) (n ≥ 3) is investigated. We proceed with the study of the "quantized" Choi matrix thus extending the methods of our previous paper [MM2]. In particular, we examine the quantized version of Størmer's extremality condition. Maps fulfilling this condition are characterized. To illustrate our approach, a careful analysis of Tang's maps is given.
On two conjectures regarding an inverse eigenvalue problem for acyclic symmetric matrices.
On weighted partial orderings on the set of rectangular complex matrices.
On -extremal non-regular graphs.
One-sided simultaneous inequalities and sandwich theorems for diagonal similarity and diagonal equivalence of nonnegative matrices.
Operator norms of words formed from positive-definite matrices.