Symmetry in Nonlinear Mathematical Physics - 2009


Anna Yusenko (Institute of Mathematics, Kyiv, Ukraine)

The representations of four projections connected with linear relation

Abstract:
We obtained description of all irreducible (up to unitary equivalence) collections of orthoprojections that satisfied the relation: α1P1 + α2P2 + α3P3 + α4P4 = γI.