Peinado, Rolando E. Finite semigroups admitting ring structure. (English) Zbl 0228.20037 Algèbre Théorie Nombres. Sém. P. Dubreil, M.-L. Dubreil-Jacotin, L. Lesieur et C. Pisot 23 (1969/70), Exp. No. DG 13, 3 p. (1970). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 20M14 Commutative semigroups Citations:Zbl 0209.00202 PDF BibTeX XML Full Text: Numdam EuDML OpenURL