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AW*-algebra
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AW*-algebra : ウィキペディア英語版
AW*-algebra
In mathematics, an AW
*-algebra is an algebraic generalization of a W
*-algebra
. They were introduced by Irving Kaplansky in 1951. As operator algebras, von Neumann algebras, among all C
*-algebra
s, are typically handled using one of two means: they are the dual space of some Banach space, and they are determined to a large extent by their projections. The idea behind AW
*-algebras is to forgo the former, topological, condition, and use only the latter, algebraic, condition.
== Definition ==

Recall that a projection of a C
*-algebra A is an element p \in A satisfying p^
*=p=p^2.
A C
*-algebra A is an AW
*-algebra when for every subset S \subseteq A, the right annihilator
:\mathrm_R(S)=\\,
is generated as a left ideal by some projection p of A, and similarly the left annihilator is generated as a right ideal by some projection q:
:\forall S \subseteq A\, \exists p,q \in \mathrm(A) \colon \mathrm_R(S)=Ap, \quad \mathrm_L(S)=qA.
Hence an AW
*-algebra is a C
*-algebras that is at the same time a Baer
*-ring
.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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