We determine the structure of Aut G and its relation to symplectic groups when G is a non-abelian p-group given by a central extension of the form 1
Prime power groups which are cyclic extensions of elementary abelian groups
โ Scribed by Gerhard Pazderski
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 562 KB
- Volume
- 97
- Category
- Article
- ISSN
- 0025-584X
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โฆ Synopsis
lGl=p", where n=n,+n,+. , . + n r 2 ) like 1) with apnn=b,, instead of apnn=l. Proof. Let G be a group of order p" with an elementary abelian normal subgroup B for which GIB is cyclic of order p"". Further let aB be a generating element of GIB. Then upnn B. The group (a) suffers from B a representation over G P ( p ) when B is in a natural manner considered to be a representation module for G'. Let (apk) be the kernel of this representation. Because of apnOC B we have CIP~'" E (cL~'"). Now we transform the representation such that CL is mapped into a matrix with JORDAN normal form, i.e. into a matrix shaped like where with a certain degree ni. A corresponding basis of B may be constituted by the elements b, (i= 1 , . . . , r ; j = 1, . . . , ni) under lexicographical order. Obviously BI= (bij j j= 1, . . . , ni) is a normal subgroup of G which affords the representation a+ai and we have
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