The diagonal of a first countable paratopological group, submetrizability, and related results A. V. Arhangelskii | Angelo Bella | Show more A. V. Arhangelskii United States Ohio University Department of Mathematics Angelo Bella Italy University of Catania Department of Mathematics Submitted: 2013-11-15 | Accepted: 2013-11-15 | DOI: https://doi.org/10.4995/agt.2007.1881