triple maps;
standard operator algebras;
additivity;
D O I:
10.1016/j.laa.2003.06.004
中图分类号:
O29 [应用数学];
学科分类号:
070104 ;
摘要:
Let A be a standard operator algebra on a Banach space of dimension > 1 and B be an algebra over the field of rational numbers. Let k be a non-zero rational number. In this note, we prove that if a bijection phi : A --> B satisfies phi(kABA) = kphi(A)phi(B)phi(A) for all A, B epsilon A, or phi(k(ABC + CBA)) = k(phi(A)phi(B)phi(C) + phi(C)phi(B)phi(A)) for all A, B, C epsilon A, then phi is additive. (C) 2003 Elsevier Inc. All rights reserved.