Monotone Normality and Nabla-Products

Hector A. Barriga-Acosta, Paul M. Gartside

Roitman's combinatorial principle $\Delta$ is equivalent to monotone normality of the nabla product, $\nabla (\omega +1{)}^{\omega }$. If $\{X_n:n\in \omega \}$ is a family of metrizable spaces and $\nabl…