T-余代数上的反-Yetter-Drinfeld模
2011-12-23张爱利李金其
张爱利,李金其,徐 宁
(浙江师范大学数理与信息工程学院,浙江 金华 321004)
T-余代数上的反-Yetter-Drinfeld模
张爱利,李金其*,徐 宁
(浙江师范大学数理与信息工程学院,浙江 金华 321004)
在T-余代数上定义了反-Yetter-Drinfeld模,给出其相容条等价条件.证明了一个左-左α-反-Yetter-Drinfeld模 M 和左-左β-反-Yetter-Drinfeld模 N 的张量积M⊗N 是左-左αβ-反-Yetter-Drinfeld模,以及βM 是左-左βαβ-1-反-Yetter-Drinfeld模.最后证明了同构定理及 Hom(M,N)也是反-Yetter-Drinfeld模.
π-余模;T-余代数;反-Yetter-Drinfeld模
0 引 言
文献[1]中定义了(α,β)-Yetter-Drinfeld模 M,并研究了模 M 的相关性质.特别地,当α=β=id时,M为Yetter-Drinfeld模;当α=S2,β=id时,M 为反-Yetter-Drinfeld模.同时,文献[2]中讨论了反-Yetter-Drinfeld模的稳定性.文献[3]将Yetter-Drinfeld模推广到T-余代数上.文献[4]在T-余代数上讨论了Yetter-Drinfeld模相容条件的等价条件.作者将反-Yetter-Drinfeld模推广到T-余代数上,给出了其相容条件的等价条件,并证明了反-Yetter-Drinfeld模同构定理.
设K是固定的域,π是固定的乘法群,α,β,λ∈π,其单位元为1.文中出现的π-余代数,π-余模等都是K 上的线性空间,映射首先是K-线性映射,文中涉及的符号、记号参见文献[5-7].
1 预备知识
2 主要结果
[1]Panaite F,Mihai D S.Generalized(anti)Yetter-Drinfeld modules as components of a braided T-category[J].Israel Journal of Mathematics,2007,158(1):349-365.
[2]Hajac Piotr M,Khalkali M,Rangipour B,et al.Stable anti-Yetter-Drinfeld modules[J].C R Acad Sci Pris Ser,2004,338(1):587-590.
[3]Zunino M.Yetter-Drinfeld modules for Turaev crossed structures[J].Journal of Pure and Applied Algebra,2004,193(3):313-343.
[4]Wang Shuanhong.Group twisted smash products and Doi-Hopf modules for T-coalgebras[J].Communications in Algebra,2004,32(9):3417-3436.
[5]Sweedler M E.Hopf algebra[M].New York:Benjamin,1969.
[6]Virelizier A.Hopf group-coalgebras[J].Journal of Pure Applied Algebra,2002,171(1):75-122.
[7]Radford D E.Yetter-Drinfel'd categories associated to an arbitrary bialgebra[J].Journal of Pure Applied Algebra,1993,87(3):259-279.
Anti-Yetter-Drinfeld Module for T-Coalgebras
ZHANG Ai-li,LI Jin-qi,XU Ning
(College of Mathematics,Physics and Information Engineering,Zhejiang Normal University,Jinhua 321004,China)
This paper defined the anti-Yetter-Drinfeld module over T-coalgebras,and discussed the equivalence of compatibility condition.The results prove that MNare left-leftαβ-anti-Yetter-Drinfeld module where Mand Nare left-left α,β anti-Yetter-Drinfeld module,respectively,andβMis left-leftβαβ-1-anti-Yetter-Drinfeld module,demonstrate an isomorphism theory and that Hom(M,N)is anti-Yetter-Drinfeld module as well.
π-comofulr;T-coalgebras;anti-Yetter-Drinfeld module
O153.3 MSC2010:16W30
A
1674-232X(2011)04-0312-04
2011-03-02
国家自然科学基金(10971188).
张爱利(1984—),女,黑龙江佳木斯人,基础数学专业硕士研究生,主要从事Hopf代数研究.*通信作者:李金其(1964—),男,浙江武义人,教授,主要从事 Hopf代数等研究.E-mail:lijinqi@zjnu.cn
10.3969/j.issn.1674-232X.2011.04.005