Applying the Kövári-Sós-Turán theorem to a question in group theory

preprint2020arXivOpen access

Abstract

Let m≤nm\leq n be positive integers and X\mathfrak X a class of groups which is closed for subgroups, quotient groups and extensions. Suppose that a finite group GG satisfies the condition that for every two subsets MM and NN of cardinalities mm and n,n, respectively, there exist x∈Mx \in M and y∈Ny \in N such that ⟨x,y⟩∈X.\langle x, y \rangle\in \mathfrak X. Then either G∈XG\in \mathfrak X or ∣G∣≤(18053)m(n−1).|G|\leq \left(\frac{180}{53}\right)^m(n-1).

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