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Chebyshevskii Sbornik, 2021, Volume 22, Issue 1, Pages 340–352
DOI: https://doi.org/10.22405/2226-8383-2018-22-1-340-352
(Mi cheb1005)
 

Homomorphisms from infinite semilcyclic n-groups to a semiabelian n-group

N. A. Shchuchkin

Volgograd State Socio-Pedagogical University (Volgograd)
References:
Abstract: One of the main problems for semiabelian n-groups is the finding of semiabelian n-groups, which are isomorphic to (n)-groups of homomorphisms from certain n-groups to a semiabelian n-group. Such n-groups are found for infinite semicyclic n-groups.
It is known that the set Hom(G,C) of all homomorphisms from n-groups G,f1 to a semiabelian (abelian) n-group C,f2 with n-ary operation g given by the rule
g(φ1,,φn)(x)=f2(φ1(x),,φn(x)),xG,
forms a semiabelian (abelian) n-group. It is proved that the isomorphisms ψ1 of n-groups G,f1 and G,f1 and  psi2 of semiabelian n-groups C,f2 and C,f2 induce an isomorphism τ of n-groups of homomorphisms Hom(G,C),g and Hom(G,C),g, which acts according to the rule τ:αψ2αψ11.
On the additive group of integers Z we construct an abelian n-group Z,f1 with n-ary operation f1(z1,,zn)=z1++zn+l, where l is any integer. For a nonidentical automorphism φ(z)=z on Z, we can specify semiabelian n-group Z,f2 for n=2k+1, kN, with the n-ary operation f2(z1,,zn)=z1z2++z2k1z2k+z2k+1. Any infinite semicyclic n-group is isomorphic to either the n-group Z,f1, where 0l[n12], or the n-group Z,f2 for odd n. In the first case we will say that such n-group has type (,1,l), and in the second case, it has type (,1,0).
In studying the n-groups of homomorphisms Hom(Z,C),g from an infinite abelian semicyclic n-group Z,f1 (0ln12) to a semiabelian n-group C,f2 we construct on the n-group C,f2 an abelian group C with the addition operation a+b=f2(a,(n3)c,ˉc,b), in which there is an element d2=f2((n)c) and an automorphism φ2(x)=f2(c,x,(n3)c,ˉc). Choose a set P1 of such ordered pairs (a,u) of elements from C that satisfy the equality la=d2+φ2(u), where φ2(x)=x+φ2(x)++φn22(x),xC is an endomorphism of the group C, and for the first component of these pairs the equality is true φ2(a)=a. On this set, we define a n-ary operation h1 by the rule h1((a1,u1),,(an,un))=(a1++an,f2(u1,,un)). It is proved that P1,h1 is a semiabelian n-group, which is isomorphic to the n-group of homomorphisms from an infinite abelian semicyclic n-group Z,f1 (0ln12) to an n-group C,f2. The consequence of this isomorphism is an isomorphism of n-groups of P1,h1 and n-groups of homomorphisms from an infinite abelian semicyclic n-group of type (,1,l) to a semiabelian n-group C,f2.
When studying the n-group of homomorphisms Hom(Z,C),g from the infinite semicyclic n-group Z,f1 to the semiabelian n-group C,f2 in the abelian group C choose the subgroup H={aC | φ2(a)=a}. On H we define a semiabelian n-group H,h, where h acts according to the rule h(a1,a2,,an1,an)=a1+φ2(a2)++φn22(an1)+an. Then in the n-group C,f2 we select the subgroup T,f2 of all idempotents, if T. It is proved that for an odd number n>1 a direct product of semiabelian n-groups H,h×T,f2 is isomorphic to n-group of homomorphisms from infinite semicyclic n-groups of Z,f1 to a semiabelian n-group C,f2 with a non empty set of idempotents T. The consequence of this isomorphism is the isomorphism of the n-group H,h×T,f2 and n-groups of homomorphisms from an infinite semicyclic n-group of type (,1,0) to the semiabelian n-group C,f2.
Similar facts were obtained when studying the n-group of homomorphisms Hom(Z,C),g from n-groups Z,f1 and Z,f1 to an abelian n-group C,f2.
Keywords: n-group, semiabelian (n,2)-group, abelian (n,2)-group, homomorphism.
Received: 12.11.2020
Accepted: 21.02.2021
Document Type: Article
UDC: 512.548
Language: Russian
Citation: N. A. Shchuchkin, “Homomorphisms from infinite semilcyclic n-groups to a semiabelian n-group”, Chebyshevskii Sb., 22:1 (2021), 340–352
Citation in format AMSBIB
\Bibitem{Shc21}
\by N.~A.~Shchuchkin
\paper Homomorphisms from infinite semilcyclic $n$-groups to a semiabelian $n$-group
\jour Chebyshevskii Sb.
\yr 2021
\vol 22
\issue 1
\pages 340--352
\mathnet{http://mi.mathnet.ru/cheb1005}
\crossref{https://doi.org/10.22405/2226-8383-2018-22-1-340-352}
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