“…When |F | = 2, our setting corresponds exactly to the study of combinatorial subspaces in FIN, the set of finite nonempty subsets of N. The resulting cardinal invariant, a FIN , was investigated by Brendle and García Ávila [5], who proved the following lower bound, which the author observed could be extended to a vec,F for general F : Theorem 1.1 (Corollary 2.11 in [14]). non(M) ≤ a vec,F .…”