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$r$ -systems of unary algebras. II: Maximal and minimal subalgebras of the direct products of unary algebras

Imrich Abrhan, Ladislav Satko (1994)

Mathematica Slovaca

Radical decompositions of semiheaps

Ian Hawthorn, Tim Stokes (2009)

Commentationes Mathematicae Universitatis Carolinae

Semiheaps are ternary generalisations of involuted semigroups. The first kind of semiheaps studied were heaps, which correspond closely to groups. We apply the radical theory of varieties of idempotent algebras to varieties of idempotent semiheaps. The class of heaps is shown to be a radical class, as are two larger classes having no involuted semigroup counterparts. Radical decompositions of various classes of idempotent semiheaps are given. The results are applied to involuted I-semigroups, leading...

Range sets and partition sets in connection with congruences and algebraic invariants.

I. Levi, S. Seif (1993)

Semigroup forum

Rees ideal algebras

Ivan Chajda (1997)

Mathematica Bohemica

We describe algebras and varieties for which every ideal is a kernel of a one-block congruence.

The paper studies tolerances and congruences on anticommutative conservative groupoids. These groupoids can be assigned in a one-to-one way to undirected graphs.

Residual finiteness of a class of semigroups presented by a single relation.

G. Lallement, L. Rosaz (1994)

Semigroup forum

Residually finite congruences and quasi-regular subsets in uniform algebras

Almeida, Jorge (1989)

Portugaliae mathematica

Currently displaying 1 – 20 of 23

Page 1 Next

Displaying 1 – 20 of 23

$r$ -systems of unary algebras. II: Maximal and minimal subalgebras of the direct products of unary algebras

Radical decompositions of semiheaps

Range sets and partition sets in connection with congruences and algebraic invariants.

Rees ideal algebras

Refinement Monoids, Vaught Monoids, and Boolean Algebras.

Regular lattices

Regularity and permutability via transferability of tolerances

Regularity in p-algebras and p-semilattices

Regularity of algebras with applications to congruence class geometry

Relation products of congruences and factor congruences

Relational characterizations of permutable and $n$ -permutable varieties

Relational classes and their characterizations

Relations, coverings, hypergraphs and matroids

Relations on the lattice of congruences of a regular semigroup.

Relative Complements in the Weak Congruence Lattice

Remark on partially ordered sets, universal algebras and semigroups

Remarks on tolerance algebras

Representation of undirected graphs by anticommutative conservative groupoids

Residual finiteness of a class of semigroups presented by a single relation.

Residually finite congruences and quasi-regular subsets in uniform algebras

Currently displaying 1 – 20 of 23