Lyapin, E. S. Partial groupoids obtained from semigroups by restrictions and homomorphisms. (English. Russian original) Zbl 0702.20041 Sov. Math. 33, No. 10, 37-45 (1989); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 1989, No. 10(329), 30-36 (1989). MSC: 20L05 PDF BibTeX XML Cite \textit{E. S. Lyapin}, Sov. Math. 33, No. 10, 37--45 (1989; Zbl 0702.20041); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 1989, No. 10(329), 30--36 (1989)
Lyapin, E. S. Partial groupoids obtained from semigroups by restrictions and homomorphisms. (Russian) Zbl 0691.20043 Izv. Vyssh. Uchebn. Zaved., Mat. 1989, No. 10(329), 30-36 (1989). Reviewer: B.Pondělíček MSC: 20L05 PDF BibTeX XML Cite \textit{E. S. Lyapin}, Izv. Vyssh. Uchebn. Zaved., Mat. 1989, No. 10(329), 30--36 (1989; Zbl 0691.20043)