A criterion for the modular isomorphism problem

创建时间:  2019/12/26  龚惠英   浏览次数:   返回

数学系Seminar第1963期

报告主题:A criterion for the modular isomorphism problem
报告人:DR.Taro Sakurai  (Chiba University, Japan)
报告时间:2019年12月27日(周五)10:00-11:00
报告地点:校本部F412
邀请人:Prof.Mikio Nakahara
主办部门:理学院数学系 
报告摘要:A fundamental theme in the study of group algebras is that what kind of properties of underlying groups (or even groups themselves) can be detected from the structure of algebras. The modular isomorphism problem—which is open for more than 60 years—asks whether an isomorphism GF(p)G = GF(p)H as unital GF(p)-algebras implies an isomorphism G = H as groups for finite p-groups G and H. Despite the problem can be stated in fairly simple terminology, this fundamental problem is considered to be very hard; even the case for finite p-groups of nilpotency class two is not solved. In this talk, we introduce a new class of finite groups (hereditary groups)  and provide a new criterion (sufficient condition) for the problem. The proof rests on adjoin and counting homomorphisms, which implies it is more combinatorial and indirect approach rather than algebraic and direct approach in nature. New proofs for the classic theorems by Deskins and Passi-Sehgal which yield positive answer to the problem for small nilpotency class and exponent are provided with the help of theorems of Ault-Watters and Bovdi on the realizability of finite p-groups as quasi-regular groups of finite quasi-regular algebras.
    
                  


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A criterion for the modular isomorphism problem

创建时间:  2019/12/26  龚惠英   浏览次数:   返回

数学系Seminar第1963期

报告主题:A criterion for the modular isomorphism problem
报告人:DR.Taro Sakurai  (Chiba University, Japan)
报告时间:2019年12月27日(周五)10:00-11:00
报告地点:校本部F412
邀请人:Prof.Mikio Nakahara
主办部门:理学院数学系 
报告摘要:A fundamental theme in the study of group algebras is that what kind of properties of underlying groups (or even groups themselves) can be detected from the structure of algebras. The modular isomorphism problem—which is open for more than 60 years—asks whether an isomorphism GF(p)G = GF(p)H as unital GF(p)-algebras implies an isomorphism G = H as groups for finite p-groups G and H. Despite the problem can be stated in fairly simple terminology, this fundamental problem is considered to be very hard; even the case for finite p-groups of nilpotency class two is not solved. In this talk, we introduce a new class of finite groups (hereditary groups)  and provide a new criterion (sufficient condition) for the problem. The proof rests on adjoin and counting homomorphisms, which implies it is more combinatorial and indirect approach rather than algebraic and direct approach in nature. New proofs for the classic theorems by Deskins and Passi-Sehgal which yield positive answer to the problem for small nilpotency class and exponent are provided with the help of theorems of Ault-Watters and Bovdi on the realizability of finite p-groups as quasi-regular groups of finite quasi-regular algebras.
    
                  


欢迎教师、学生参加!

上一条: A large-scale genome-wide association study in the human pathogen Streptococcus pyogenes with a point-mutation switch system

下一条:Cvetkvic-Rowlinson 猜想的证明