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Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, 2016, Number 1, Pages 91–117
(Mi basm408)
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On paratopies of orthogonal systems of ternary quasigroups. I
P. Syrbu, D. Ceban Department of Mathematics, Moldova State University, Mateevici str., 60, MD-2009, Chisinau, Moldova
Abstract:
A paratopy of an orthogonal system $\Sigma=\{A_1,A_2,\dots,A_n\}$ of $n$-ary quasigroups, defined on a nonempty set $Q$, is a mapping $\theta\colon Q^n\mapsto Q^n$ such that $\Sigma\theta=\Sigma$, where $\Sigma\theta=\{A_1\theta, A_2\theta,\dots,A_n\theta\}$. The paratopies of the orthogonal systems, consisting of two binary quasigroups and two binary selectors, have been described by Belousov in [1]. He proved that there exist 9 such systems, admitting at least one non-trivial paratopy and that the existence of paratopies implies (in many cases) the parastrophic-orthogonality of a quasigroup from $\Sigma$. A generalization of this result (ternary case) is considered in the present paper. We prove that there exist 153 orthogonal systems, consisting of three ternary quasigroups and three ternary selectors, which admit at least one non-trivial paratopy. The existence of paratopies implies (in many cases) some identities. One of them was considered earlier by T. Evans, who proved that it implies the self-orthogonality of the corresponding ternary quasigroup. The present paper contains the first part of our investigation. We give the necessary and sufficient conditions when a triple $\theta$, consisting of three ternary quasigroup operations or of a ternary selector and two ternary quasigroup operations, defines a paratopy of $\Sigma$.
Keywords and phrases:
ternary quasigroup, orthoghonal system, strongly orthogonal system, paratopy, self-orthogonal quasigroup.
Received: 20.01.2016
Citation:
P. Syrbu, D. Ceban, “On paratopies of orthogonal systems of ternary quasigroups. I”, Bul. Acad. Ştiinţe Repub. Mold. Mat., 2016, no. 1, 91–117
Linking options:
https://www.mathnet.ru/eng/basm408 https://www.mathnet.ru/eng/basm/y2016/i1/p91
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Abstract page: | 180 | Full-text PDF : | 50 | References: | 43 |
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