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About: Augmentation (algebra)     Goto   Sponge   NotDistinct   Permalink

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In algebra, an augmentation of an associative algebra A over a commutative ring k is a k-algebra homomorphism , typically denoted by ε. An algebra together with an augmentation is called an augmented algebra. The kernel of the augmentation is a two-sided ideal called the augmentation ideal of A. For example, if is the group algebra of a finite group G, then is an augmentation. If A is a graded algebra which is connected, i.e. , then the homomorphism which maps an element to its homogeneous component of degree 0 is an augmentation. For example, is an augmentation on the polynomial ring .