MATHEMATICAL PROPERTIES OF THE REGULAR *-REPRESENTATION OF MATRIX *-ALGEBRAS WITH APPLICATIONS TO SEMIDEFINITE PROGRAMMING

摘要

In this paper we give a proof for the special structure of the Wedderburn decomposition of the regular *-representation of a given matrix *-algebra. This result was stated without proof in: de Klerk, E., Dobre, C. and Pasechnik, D.V.: Numerical block diagonalization of matrix *-algebras with application to semidefinite programming, Mathematical Programming-B, 129 (2011), 91-111; and is used in applications of semidefinite programming (SDP) for structured combinatorial optimization problems. In order to provide the proof for this special structure we derive several other mathematical properties of the regular *-representation.