Hopf algebra
plural of playfield
(adjectival) Secret; covert; undisclosed. / (adverbial) Secretly; covertly; undisclosedly. / Used other than figuratively or idiomatically: see under, table.
(organic chemistry) saponification of a single ester group
(mathematics) A structure that is simultaneously a unital associative algebra and a counital coassociative coalgebra, equipped with an antiautomorphism satisfying a certain property.
現代の量子群論では、単位元を持つ結合代数であり、余単位を持つ余結合コアルジェブラで、アンチポード（反同型写像）を備えた構造が、乗法と余乗法の両方の構造を持つ対称性を記述するための代数的枠組みを提供する。
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