Noronha Galvão, M. L.; Almeida Costa, A. Sur le demi-anneau des nombres naturels. (French) Zbl 0166.30102 Anais Fac. Ci. Porto 48, 35-39 (1965). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:generalized rings, nonassociative rings PDFBibTeX XML