ISSN:0092-7872    

DOI:10.1080/00927879808826214

出版商:Gordon and Breach Science Publishers Ltd.    

年代:1998

数据来源: Taylor

ISSN:0092-7872    

DOI:10.1080/00927879808826215

出版商:Gordon and Breach Science Publishers Ltd.    

年代:1998

数据来源: Taylor

摘要:

In this paper we construct families of algebraic nonsingular 3-foldsXof general type having minimalfor theirpgin order that the canonical morphism is finite of degree 3- For such 3-folds it isandpgis odd.

ISSN:0092-7872    

DOI:10.1080/00927879808826216

出版商:Gordon and Breach Science Publishers Ltd.    

年代:1998

数据来源: Taylor

摘要:

LetKbe a field which contains thed-th roots of unity. SupposeKhas characteristic 0 or char(K) ∤d. Letf(X) ∈K[X] be an irreducible and separable polynomial of degreemwith Galois group 𝔤. If 𝔤 acts doubly transitively on the set of roots off(Xd) and if the order of 𝔤 anddare relatively prime, then the Galois group off(Xd) over a splitting field off(X) is isomorphic towhered3|d2|d1|d. We prove that forthe Mathieu groupsand some other groups the same statement holds true for any. We further give equivalent interpretations ford1andd2.

ISSN:0092-7872    

DOI:10.1080/00927879808826217

出版商:Gordon and Breach Science Publishers Ltd.    

年代:1998

数据来源: Taylor

ISSN:0092-7872    

DOI:10.1080/00927879808826218

出版商:Gordon and Breach Science Publishers Ltd.    

年代:1998

数据来源: Taylor

摘要:

Let a finite dimensional algebraRbe a split extension of an algebraAby a nilpotent bimoduleQ. We give necessary and sufficient conditions for a (partial) tilting moduleTAto be such thatT⊗ARRis a (partial) tilting module. If this is not the case, butQAis generated by the tilting moduleTA, then there exists a quotient[Rbar]ofRsuch thatT⊗A[Rbar][Rbar]is a tilting module.

ISSN:0092-7872    

DOI:10.1080/00927879808826219

出版商:Gordon and Breach Science Publishers Ltd.    

年代:1998

数据来源: Taylor

ISSN:0092-7872    

DOI:10.1080/00927879808826220

出版商:Gordon and Breach Science Publishers Ltd.    

年代:1998

数据来源: Taylor

摘要:

Inspired by the work of Mirollo and Vilonen [MV] describing the categories of perverse sheaves as module categories over certain finite dimensional algebras, Dlab and Ringel introduced [DR2] an explicit recursive construction of these algebras in terms of the algebrasA(γ). In particular, they characterized the quasi-hereditary algebras of Cline-Parshall-Scott [PS] and constructed them in this way. The present paper provides a characterization of lean algebras and some other special classes of algebras in terms of this recursive process.

ISSN:0092-7872    

DOI:10.1080/00927879808826221

出版商:Gordon and Breach Science Publishers Ltd.    

年代:1998

数据来源: Taylor

ISSN:0092-7872    

DOI:10.1080/00927879808826222

出版商:Gordon and Breach Science Publishers Ltd.    

年代:1998

数据来源: Taylor

ISSN:0092-7872    

DOI:10.1080/00927879808826223

出版商:Gordon and Breach Science Publishers Ltd.    

年代:1998

数据来源: Taylor