Central Products of Subgroups and Block Theory of Finite Groups

2014 ◽  
Vol 67 (1-2) ◽  
pp. 111-124 ◽  
Author(s):  
Morton E. Harris
Author(s):  
B. H. Neumann

AbstractSome new classes of finite groups with zero deficiency presentations, that is to say presentations with as few defining relations as generators, are exhibited. The presentations require 3 generators and 3 defining relations; the groups so presented can also be generated by 2 of their elements, but it is not known whether they can be defined by 2 relations in these generators, and it is conjectured that in general they can not. The groups themselves are direct products or central products of binary polyhedral groups with cyclic groups, the order of the cyclic factor being arbitrary.


Author(s):  
J. L. Mennicke ◽  
B. H. Neumann

AbstractCertain central products of the binary polyhedral groups with finite cyclic groups are here shown to have presentations with two generators and two defining relations; this disproves a conjecture of the second author, stated in J. Austral. Math. Soc. Ser. A 38 (1985), 230–240.


Author(s):  
Simon R. Blackburn ◽  
Peter M. Neumann ◽  
Geetha Venkataraman
Keyword(s):  

Author(s):  
Burkhard Külshammer
Keyword(s):  

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