Gheri's conjecture on the p-Frobenius ratio

Let GG be a finite group and let pp be a prime dividing G|G|. Define

Up(G)=PSylp(G)P\mathfrak{U}_p(G)=\bigcup_{P\in \operatorname{Syl}_p(G)}P

to be the set of pp-elements of GG. If PP is a Sylow pp-subgroup of GG, the positive integer Up(G)/P|\mathfrak{U}_p(G)|/|P| is called the pp-Frobenius ratio of GG, and let np(G)n_p(G) denote the number of Sylow pp-subgroups of GG.

Gheri's conjecture. The pp-Frobenius ratio satisfies

Up(G)Pnp(G)11p.\frac{|\mathfrak{U}_p(G)|}{|P|}\geq n_p(G)^{1-\frac{1}{p}}.

The conjecture seeks a lower bound for the Frobenius ratio in terms of the number of Sylow pp-subgroups. The ratio is known to be a positive integer by Frobenius' theorem, but its broader combinatorial meaning and the proposed bound remain open in general.

Sources & referencesView supporting material

Primary source

Pietro Gheri, “On the number of p-elements in a finite group”, arXiv:2007.00967 (2020).

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