Mathematical Journal of Okayama University Volume 46, Issue 1 2004 Article 11 JANUARY 2004 Principal Ideals in Ore Extensions Wagner Cortes ∗ Miguel Ferrero † * Universidade Estadual † Universidade Federal do Rio Grande do Sul Copyright c 2004 by the authors. Mathematical Journal of Okayama University is produced by The Berkeley Electronic Press (bepress). http://escholarship.lib.okayama-u.ac.jp/mjou