Semilattice sums of algebras and Mal’tsev products of varieties
Semilattice sums of algebras and Mal’tsev products of varieties
复制标题
代数的半格和以及簇的 Malâtsev 乘积
DOI:
10.1007/s00012-020-00656-8
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发表时间:
2020
影响因子:
0.6
通讯作者:
Romanowska, A. B.
中科院分区:
文献类型:
--
作者:
Bergman, C.;Penza, T.;Romanowska, A. B.
The Mal’tsev product of two varieties of similar algebras is always a quasivariety. We consider the question of when this quasivariety is a variety. The main result asserts that ifis a strongly irregular variety with no nullary operations and at least one non-unary operation, andis the variety, of the same type as, equivalent to the variety of semilattices, then the Mal’tsev productis a variety. It consists precisely of semilattice sums of algebras in. We derive an equational base for the product from an equational base for. However, ifis a regular variety, then the Mal’tsev product may not be a variety. We discuss various applications of the main result, and examine some detailed representations of algebras in.
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影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
1988
期刊:
影响因子:
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