Wreath Products, Sylow's Theorem and Fermat's Little Theorem

B. Sury


The assertion that the number of

p-Sylow subgroups in a finite group is = 1 mod p, begs the natural question whether one may obtain the power a^p-1 (for any (a, p) = 1) as the number of p-Sylow subgroups in some group naturally. Indeed, it turns out to be so as we show below. The construction involves wreath products of groups. Using wreath products, a different generalization of Euler’s congruence (and, a fortiori, of Fermat’s little theorem) was obtained in [1].


wreath products, Sylow's theorem

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