AFC-代数上的Schur积与完全正映射

SCHUR PRODUCTS ON AF C *-ALGEBRAS AND COMPLETELY POSITIVE MAPS

设Ｂ是作用在Ｈｉｌｂｅｒｔ空间Ｈ上的含单位元的ＡＦＣ＿代数，Ｄ是Ｂ的典型ｍａｓａ，Ｓ是Ｂ中的范数闭算子系统并且是ＣｈｏｒｄａｌＤ＿双模，则任给Ｓ中正元ｇ，存在完全正映射ψｇ：Ｂ→Ｂ（Ｈ）使得任给ｆ∈Ｓ，ψｇ（ｆ）＝ｇｆ，其中ｆｇ是ｇ与ｆ的Ｓｃｈｕｒ积．

Let B be an AF C *-algebra acting on Hilbert space H with canonical masa D, S be norm closed operator system and Chordal D _bimodule in B . Then for every positive element y in S , there is some completely positive map ψ g:B→B(H) such that ψ g(f)=g*f for f in S , where g*f is the schur product of g and f .