Nondiscrete P-groups can be reflexive (Q617731)

Let \(G=\prod_{i\in I}D_i\) be a Cartesian product of Abelian groups endowed with a topology defined by the family of subgroups \(\{\prod_{i\in J}D_i:J\subset I\), \(|I\setminus J|\leqslant \aleph_0\}\) as a basis at zero. The authors prove that \(G\) is reflexive. Everything else is around this example.