188 results about "Operator system" patented technology

Given a unital C*-algebra A, a *-closed subspace S containing 1 is called an operator system. One can associate to each subspace M⊆A of a unital C*-algebra an operator system via S:=M+M*+ℂ1. The appropriate morphisms between operator systems are completely positive maps. By a theorem of Choi and Effros, operator systems can be characterized as *-vector spaces equipped with an Archimedean matrix order.