Talk:Quasidihedral group
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Only ones
[edit]How do you know that these are the only isomorphism classes? — Preceding unsigned comment added by 134.60.66.123 (talk) 2008-09-01T12:32:24Z
- This is Satz 14.9.b in the reference by Huppert listed in the article. It occurs on page 91, part of the 4 pages given as the reference. I believe it is also proved in the 7 pages listed in the Gorenstein reference. It is a fairly common thing to prove in finite group texts; for instance, Th 12.5.1 in Hall's Theory of Groups. The references chosen were meant to emphasize the names given to the groups. Often the result is proved, but the two "leftover" groups only have symbolic names like "M(2^n)" or "G". The Huppert and Gorenstein reference name one of the leftover groups, but differently. JackSchmidt (talk) 16:28, 1 September 2008 (UTC)