We shall provide a large class of extremal positive maps in _M_3(C) which are neither 2-positive nor 2-copositive and study the algebraic structure of the set of all positive linear maps in _M_3(C).
Cite this article
Hiroyuki Osaka, A Class of Extremal Positive Maps in 3 x 3 Matrix Algebras. Publ. Res. Inst. Math. Sci. 28 (1992), no. 5, pp. 747–756DOI 10.2977/PRIMS/1195167934