訂正日: 2006/09/29訂正理由: -訂正箇所: 引用文献情報訂正内容: Right : [1] A. H. Clifford and G. B. Preston, The Algebraic Theory of Semigroups, vol. I, II, Math. Surveys 7, Amer. Math. Soc., 1961, 1967. [2] M. R. Croisot, Demi-groupes simples inversifs à gauche, C. R. Acad. Sci. Paris, 239 (1954), 845-847. [3] Kenneth M. Kapp and Hans Schneider, Completely O-Simple Semigroups, W. A. Benjamin, New York, 1969. [4] Bruce W. Mielke, Regular congruences on a simple semigroup with a minimal right ideal, to appear, Publ. Math. Debrecen. [5] Tôru Saitô and Shigeo Hori, On semigroups with minimal left ideals and without minimal right ideals, J. Math. Soc. Japan, 10 (1958), 64-70. [6] Marianne Teissier, Sur les demi-groupes ne contenant pas d'élément idempotent, C. R. Acad. Sci. Paris, 237 (1953), 1375-77.