Geodesic
Congruences of a free unar
Čebyševskij sbornik, Tome 24 (2023) no. 1, pp. 15-26

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We obtain a complete description of all congruences of a free unar with arbitrary set of free generators. Namely, every congruence is characterized uniquely by a collection of parameters which are either non-negative integers or the symbol $\infty$; the restrictions on the parameters are formulated.
Keywords: act over senigroup, unar, congruence. 
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K. V. Budiyanskaya; I. B. Kozhukhov. Congruences of a free unar. Čebyševskij sbornik, Tome 24 (2023) no. 1, pp. 15-26. http://geodesic.mathdoc.fr/item/CHEB_2023_24_1_a1/