Título: The diagonal of a first countable paratopological group, submetrizability, and related results
Autor: Arhangelskii, A.V.; Bella, Angelo
Resumen: [EN] We discuss some properties stronger than Gδ-diagonal. Among other things, we prove that any first countable paratopological group has a Gδ-diagonal of infinite rank and hence also a regular Gδ-diagonal. This answer a question recently asked by Arhangel’skii and Burke.