# 2-Groups with normal noncyclic subgroups - download pdf or read online

By Liman F.N.

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**Extra info for 2-Groups with normal noncyclic subgroups**

**Example text**

0) ~ . s aE x ~ ffil X j C j . ~ j characteristic as i n F o r any • has period Since a characteristic is as i n an i s o m o r p h i s m , the the hypotheses o f Lemma 4. Suppose further that i s a B s V, B ffi (B1, B2, . . 'lsj = 0 (mod n) and (ii) ~8jcj = 0 j=l J Then t h e r e Proof: I. hand side zero. form characteristic. has period are of the is complete. Lemma 5: there J(Wl) period Lemma 8, P a r t formula proof in is a X e R Suppose first so t h a t that Xj = Bj PO = O. for all By f o r m u l a in J(Wl) j.

Since a t• X t ~ 0 either all t are zero or else there is • • • which is positive. Considering these two possibilities yields several corollaries. Corollary exponential (27) 1. _u;B1) for all • e R. and a c o n s t a n t Then t h e r e ~B ~ 0 is an so t h a t 28 = ~8-FFo[eo xeR Moreover, as an of formula n th that for order theta-function (27) has a (1/2)-integer is independent of Proof: - ZSxjvj'luo(xoj ) . ex](U;B0). 8 = (B1,B2, By Lemma 3 t h e r e is J(W0). theory characteristic [~8jcj - e 1] after is an the statement of this n th each side ...

And 5(cj Suppose W1 el) = -3e I fl' f2 so that i) Z5. j = 1,2,5,4. Also j. o f genus two a d m i t t i n g a Then t h e r e a r e two one- < f l > ~ ___

### 2-Groups with normal noncyclic subgroups by Liman F.N.

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