On products of Δ-sets
Rodrigo Carvalho, Vinicius de Oliveira Rodrigues · Proceedings of the American Mathematical Society · 2024
We prove the consistency of the existence of a Q Q -set whose square is not a Δ \Delta -set and that if there is a Δ \Delta -set, then there exists a Δ \Delta -set whose all finite powers are Δ \Delta -sets.