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For example, if is the group algebra of a group G, then
is an augmentation. The kernel is called the augmentation ideal of A.
- Loday, Jean-Louis; Vallette, Bruno (2012). Algebraic operads. Grundlehren der Mathematischen Wissenschaften 346. Berlin: Springer-Verlag. p. 2. ISBN 978-3-642-30361-6. Zbl 1260.18001.
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