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Augmentation (algebra) : ウィキペディア英語版
Augmentation (algebra)
In algebra, an augmentation of an associative algebra ''A'' over a field ''k'' is an algebra homomorphism A \to k, typically denoted by ε. An algebra together with an augmentation is called an augmented algebra.
For example, if A =k() is the group algebra of a group ''G'', then
:A \to k, \, \sum a_i x_i \mapsto \sum a_i
is an augmentation. The kernel is called the augmentation ideal of ''A''.
==References==

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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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