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The theorem, that all groups of order divisible by prime number p contain a subgroup of order p, "proved" by Cauchy in 1845, was enunciated by Galois in 1831 and first proved clearly and correctly by Frobenius in 1884.
This work has been published in the journal
Historia Mathematica
volume 31, Number 2
date May 2004
pages 196-211
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