期刊名称：International Journal of Mathematics and Mathematical Sciences
印刷版ISSN：0161-1712
电子版ISSN：1687-0425
出版年度：2002
卷号：29
DOI：10.1155/S0161171202004659
出版社：Hindawi Publishing Corporation
摘要：Let U and V be, respectively, an infinite- and a
finite-dimensional complex Banach algebras, and let
U⊗pV be their projective tensor product. We prove
that (i) every compact Hermitian operator T1 on U gives rise to a compact Hermitian operator T on U⊗pV having the properties that ‖T1‖=‖T‖ and sp(T1)=sp(T);
(ii) if U and V are separable and U has
Hermitian approximation property (HAP), then U⊗pV is also separable and has HAP;
(iii) every compact analytic semigroup (CAS) on U induces the existence of a CAS on U⊗pV having some nice properties. In addition, the converse of the above results are discussed and some open problems are posed.
