Суммы степеней бинарных отношений

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Суммы степеней бинарных отношений. (Russian) [Sums of Powers of Binary Relations]. Matematický časopis, vol. 24 (1974), issue 2, pp. 161-171

MSC: 03E20, 04A05, 05C20, 08A05, 20M10 | MR 0363909 | Zbl 0286.20075

References:

[1] SCHWARZ Š.: On the semigroup of binary гelations on a finite set. Czechoslovak Math. J. 20 (95), 1970, 632-679. MR 0296190

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