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Taft Hopf algebra : ウィキペディア英語版
Taft Hopf algebra
In algebra, a Taft Hopf algebra is a Hopf algebra introduced by that is neither commutative nor cocommutative and has an antipode of large even order.
==Construction==

Suppose that ''k'' is a field with a primitive ''nth root of unity ζ for some positive integer ''n''. The Taft algebra is the ''n''2-dimensional associative algebra generated over ''k'' by ''c'' and ''x'' with the relations ''c''''n''=1, ''x''''n''=0, ''xc''=ζ''cx''. The coproduct takes ''c'' to ''c''⊗''c'' and ''x'' to ''c''⊗''x'' + ''x''⊗1.
The counit takes ''c'' to 1 and ''x'' to 0. The antipode takes ''c'' to ''c''−1 and ''x'' to –''c''−1''x'': the order of the antipode is 2''n''.

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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