Radford’s Biproducts for Hopf Group-Coalgebras and Its Quasitriangular Structures
Radford’s Biproducts for Hopf Group-Coalgebras and Its Quasitriangular Structures
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DOI:
10.1007/s12188-013-0079-x
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发表时间:
2013-05
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影响因子:
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通讯作者:
B. Shen;Ling Liu
中科院分区:
文献类型:
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作者:
B. Shen;Ling Liu
Letπbe a group andH={Hα}α∈πbe a semi-Hopfπ-coalgebra in the sense of Virelizier (J. Pure Appl. Algebra 171:75–122, 2002). LetHcoact weakly on a coalgebraBandλ={λα,β:B⟶Hα⊗Hβ} be a family ofk-linear maps. Then in this paper we first introduce the notion of aπ-crossed coproductand find some sufficient and necessary conditions making it into aπ-coalgebra, generalizing the main construction in Lin (Commun. Algebra 10:1–17, 1982). Secondly, we find a sufficient and necessary condition for, with theπ-crossed coproductandπ-smash productB#πHto form a semi-Hopfπ-coalgebra, ifλis convolution invertible dual 2-cocycle, which generalizes the well-known Radford’s biproduct in Radford (J. Algebra 92:322–347, 1985). Furthermore, we derive some sufficient conditions forto be a Hopfπ-coalgebra. Finally, we construct a quasitriangular structure on the Hopfπ-coalgebra(with the usual tensor product).