Partial groupoids with some associativity conditions

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Partial groupoids with some associativity conditions. (English). Matematický časopis, vol. 21 (1971), issue 4, pp. 285-311

MSC: 20L05, 20M99 | MR 0302787 | Zbl 0249.20037

References:

[1] Clifford A. H., Preston G. B.: The Algebraic Theory of Semigroups, I. Providence, 1961.

[2] Hasse M., Michler L.: Theorie der Kategorien. Berlin 1966. MR 0213411 | Zbl 0192.09701

[3] Hrmová R.: Relative ideals in semigroups. Mat. časop. 17 (1967), 206-222. MR 0223471

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