Authors: Parascovia Syrbu, Dina Ceban
Abstract
Quasigroups satisfying the identity $ x(x\cdot xy) = y$ are called $\pi$-quasigroups of type
$T_{1}$. The spectrum of the defining identity is precisely $q = 0 \ \text {or} \ 1 (\text
{mod}\ 3)$, except for $q = 6$. Necessary conditions when a finite $\pi$-quasigroup of type
$T_{1}$ has the order $q = 0\ (\text {mod}\ 3)$, are given. In particular, it is proved that
a finite $\pi$-quasigroup of type $T_{1}$ such that the order of its inner mapping group is
not divisible by three has a left unit. Necessary and sufficient conditions when the identity
$ x(x\cdot xy) = y$ is invariant under the isotopy of quasigroups (loops) are found.
State University of Moldova
60 A.Mateevici str., MD-2009 Chishinau
Moldova
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