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Bimodule : ウィキペディア英語版
Bimodule
In abstract algebra, a bimodule is an abelian group that is both a left and a right module, such that the left and right multiplications are compatible. Besides appearing naturally in many parts of mathematics, bimodules play a clarifying role, in the sense that many of the relationships between left and right modules become simpler when they are expressed in terms of bimodules.
== Definition ==
If ''R'' and ''S'' are two rings, then an ''R''-''S''-bimodule is an abelian group ''M'' such that:
# ''M'' is a left ''R''-module and a right ''S''-module.
# For all ''r'' in ''R'', ''s'' in ''S'' and ''m'' in ''M'':
::(rm)s = r(ms) .
An ''R''-''R''-bimodule is also known as an ''R''-bimodule.

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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