Protasov, I.V.; Slobodianiuk, S.
(Algebra and Discrete Mathematics, 2012)
A subset S of a group G is called thick if, for any finite subset F of G, there exists g ∈ G such that Fg ⊆ S, and k-prethick, k ∈ N if there exists a subset K of G such that |K| = k and KS is thick. For every finite ...