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math.FA2026
On the ascent and the angle between the null space and the range of elementary operators
Janko Bračič, Bojan Kuzma, Hranislav Stanković
We study the angle between the null space and the range of elementary operators of length one or two acting on , the Banach algebra of all bounded linear…
math.FA2024
Reflexive subspace lattices in Banach spaces
Janko Bračič
In this survey paper we present known results about reflexive subspace lattices. We show that every nest and every atomic Boolean subspace lattice in a complex Banach space is refl…
math.FA2022
Collineations preserving the lattice of invariant subspaces of a linear transformation
Janko Bračič, Marko Kandić
Given a linear transformation on a finite-dimensional complex vector space $\eV$, in this paper we study the group $\Col(A)$ consisting of those invertible linear transformatio…