Lemmermeyer猜想的反例
Counterexamples to a conjecture of Lemmermeyer
摘要:
我们产生了无穷多个有限2-群,它们不以指数2嵌入任何由对合生成的群中。这反驳了一个猜想的Lemmermeyer和限制可能的伽罗瓦群的非分歧2-扩展,伽罗瓦的有理数,二次数域。
英文摘要:
We produce infinitely many finite 2-groups that do not embed with index 2 in any group generated by involutions. This disproves a conjecture of Lemmermeyer and restricts the possible Galois groups of unramified 2-extensions, Galois over the rationals, of quadratic number fields.
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