Beltrán, Antonio; Felipe Román, María Josefa(Taylor & Francis: STM, Behavioural Science and Public Health Titles, 2011-03-18)
We determine the structure of all finite groups with four class sizes when two of them are coprime numbers larger than 1. We prove that such groups are solvable and that the set of class sizes is exactly {1, m, n, mk}, ...
Ali Akbar, Kamaludheen; Mubeena, T.(Universitat Politècnica de València, 2022-10-03)
[EN] In this article, we prove that the group of all increasing homeomorphisms on R has exactly five normal subgroups, and the group of all homeomorphisms on R has exactly four normal subgroups. There are several results ...