18 citations · 19 across the 12 of their papers we have counts for
Showing 2024Show all
3 papers · 1 filter
math.FA2024
A note on common complements
Esteban Andruchow, Eduardo Chiumiento
We discuss the structure of the set consisting of pairs of closed subspaces that have a common complement in a Hilbert space previously studied by Lauzon and Treil (J. Funct. A…
math.FA2024
Subspaces with or without a common complement
Esteban Andruchow, Eduardo Chiumiento
Let H be a separable complex Hilbert space. Denote by Gr(H) the Grassmann manifold of H. We study the following sets of pairs of elements in Gr(H): Delta={(S,T) in Gr(H) x Gr(H): t…
math.FA2024
Homogeneous spaces in Hartree-Fock-Bogoliubov theory
Claudia D. Alvarado, Eduardo Chiumiento
We study the action of Bogoliubov transformations on admissible generalized one-particle density matrices arising in Hartree-Fock-Bogoliubov theory. We show that the orbits of this…