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数学
ON THE ORDER OF REGULAR RINGS
<正> I. INTRODUCTION A ring R is called a regular ring if a∈aRa, for each a∈R. A solution to axa=a is called an inner inverse of a ,denoted by a~-. A solution to xax=x is called an outer inverse of a. A solution to both axa=a and xax=x is called a reflexive inverse of a, and denoted by a~+. Inner and reflexive inverses of an element are not unique in general. The sets of all in-
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Chinese Science Bulletin
1989年17期

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