Morgado, JosĂ© A theorem on entropic groupoids. (English) Zbl 0208.29601 Port. Math. 26, 449-452 (1967). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 20N02 Sets with a single binary operation (groupoids) PDFBibTeX XMLCite \textit{J. Morgado}, Port. Math. 26, 449--452 (1967; Zbl 0208.29601) Full Text: EuDML