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Semilattices of definable subalgebras. II
A. G. Pinus Novosibirsk, Russia
Abstract:
In studying derived objects on universal algebras, such as automorphisms, endomorphisms, congruences, subalgebras, etc., we are naturally interested in those that can be defined by the means of the universal algebras themselves (i.e., are definable in one sense or another) – in particular in what part of all relevant derived objects is constituted by these. It is proved that for any algebraic lattice L and any of its $0$-$1$-lower subsemilattices $L_0\subseteq L_1\subseteq L_2$, there exist a universal algebra $\mathcal A$ and an isomorphism $\varphi$ of the lattice $L$ onto the lattice $\mathrm{Sub}\mathcal A$ such that $\varphi(L_0)=\mathrm{OFSub}\mathcal A$, $\varphi(L_1)=\mathrm{POFSub}\mathcal A$, $\varphi(L_2)=\mathrm{FSub}\mathcal A$, and $\mathrm{PFSub}\mathcal A=\mathrm{FSub}\mathcal A$.
Keywords:
semilattice, definable subalgebra.
Received: 15.05.2009 Revised: 16.12.2011
Citation:
A. G. Pinus, “Semilattices of definable subalgebras. II”, Algebra Logika, 51:2 (2012), 276–284; Algebra and Logic, 51:2 (2012), 185–191
Linking options:
https://www.mathnet.ru/eng/al534 https://www.mathnet.ru/eng/al/v51/i2/p276
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Abstract page: | 294 | Full-text PDF : | 69 | References: | 47 | First page: | 20 |
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