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Hopf扩张下的余纯投射维数

Copure projective dimensions under Hopf extensions
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摘要 令H为有限维Hopf代数且A为固定域k上的代数。证明了当H半单及A/AH为H*-Galois扩张时,A#H的余纯(copure)投射维数与A的余纯投射维数是相同的。作为应用,进一步证明了当H半单及A/AH为H*-Galois扩张时,A是QF环当且仅当A#H是QF环。并且利用Hopf扩张下的(co)induction函子来研究A#H-模范畴及AH-模范畴之间余纯投射维数的关系。 Let H be a finite dimensional Hopf algebra and A be an algebra over a fixed field k. It is proved that the left copure projective dimension of A#H and that of A is the same when H is semisimple and the extension A /AHis H*-Galois. Moreover,it is shown that A#H is QF if and only if A is QF. Using( co) induction functors,we study the relations between copure projective dimensions in A#H-Mod and the counterparts in AH-Mod.
机构地区 东南大学数学系
出处 《山东大学学报(理学版)》 CAS CSCD 北大核心 2014年第10期7-10,共4页 Journal of Shandong University(Natural Science)
基金 国家自然科学基金资助项目(11371089) 江苏省博士后基金资助项目(1302019C)
关键词 Hopf扩张 余纯投射维数 QF环 Hopf extension copure projective dimension QF ring
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