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Dual module
In mathematics, the dual module of a left (resp. right) module ''M'' over a ring ''R'' is the set of module homomorphisms from ''M'' to ''R'' with the pointwise right (resp. left) module structure. Every module has a canonical homomorphism to the dual of its dual (called the double dual). A reflexive module is one for which the canonical homomorphism is an isomorphism. A torsionless module is one for which the canonical homomorphism is injective. ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Dual module」の詳細全文を読む
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