2 papers
math.FA2026
On positive automorphisms of algebras of operators on atomic Archimedean vector lattices
Gregor Cigler, Marko Kandić
Let be an Archimedean vector lattice. We investigate subalgebras of consisting of regular operators that contain all rank-one operators of the form $a \otimes…
math.FA2012
On semigroups of matrices with nonnegative diagonals
Grega Cigler, Roman Drnovšek
We give a short proof of a recent result by Bernik, Mastnak, and Radjavi, stating that an irreducible group of complex matrices with nonnegative diagonal entries is diagonally simi…