On pairs of generalized and hypergeneralized projections on a Hilbert space
Sonja Radosavljevic, Dragan S. Djordjević · KTH Publication Database DiVA (KTH Royal Institute of Technology) · 2012
In this paper, we characterize generalized and hypergeneralized projections (bounded linear operators which satisfy conditions A2=A*and A2=A†). We give theirs matrix representations and examine under what conditions the products, differences, and sums of these operators are operators of the same class.