The product of Lindelöf groups and $\mathbb R$-factorizability (2303.06369v4)

Abstract: Lindel\"of topological groups $G_1$ , $H_1$, $G_2$, $H_2$ are constructed in such a way that the products of $G_1 \times H_1$ and $G_2 \times H_2$ are not $\mathbb R$-factorizable groups and (1) the group $G_1 \times H_1$ is not pseudo-$\aleph_1$-compact; (2) the group $G_2 \times H_2$ is a separable not normal group and contains a discrete closed subset of the cardinality continuum.