Skip to main content (access key 's'), Skip to navigation (access key 'n'), Accessibility information (access key '0')

Back to Simple Search

Advanced Search

Match of the following rules

Add Another Rule

Contains the following math formula (red border means the formula is incomplete)

Formula preview

Currently displaying 1 – 20 of 40

Order by Relevance | Title | Year of publication

Onesided inverses for semigroups.

Petrich, Mario — 2006

Acta Mathematica Universitatis Comenianae. New Series

Special congruence triples for a regular semigroup.

Petrich, Mario — 2011

Acta Mathematica Universitatis Comenianae. New Series

A special congruence lattice of a regular semigroup.

Petrich, Mario — 2007

Acta Mathematica Universitatis Comenianae. New Series

The maximal matrix decomposition of a semigroup

Petrich, Mario — 1966

Portugaliae mathematica

Relatively free *-bands.

Petrich, Mario; Silva, Pedro V. — 2000

Beiträge zur Algebra und Geometrie

Congruences on strong semilattices of regular simple semigroups.

Mario Petrich — 1988

Semigroup forum

Sur la décomposition demi-réticulée maximale d'un demi-groupe

Séminaire Dubreil. Algèbre et théorie des nombres

L'enveloppe de translations d'un demi-treillis de groupes

Séminaire Dubreil. Algèbre et théorie des nombres

Two Congruence Lattices of Completely Simple Semigroups.

Mario Petrich — 1993

Monatshefte für Mathematik

The maximal semilattice decomposition of a semigroup.

Mario Petrich. — 1964

Mathematische Zeitschrift

All subvarieties of a certain variety of semigroups.

Mario Petrich — 1974

Semigroup forum

Dense extensions of completely 0-simple semigroups. II.

Mario Petrich — 1973

Journal für die reine und angewandte Mathematik

Dense extensions of completely 0-simple semigroups. I.

Mario Petrich — 1973

Journal für die reine und angewandte Mathematik

Completely semisimple semigroups whose idempotents from a tree.

Mario Petrich — 1976

Journal für die reine und angewandte Mathematik

Free inverse semigroups

Mario Petrich — 1990

Colloquium Mathematicae

Extensions normales de demi-groupes inverses

Mario Petrich — 1981

Fundamenta Mathematicae

Some relations on the lattice of varieties of completely regular semigroups

Mario Petrich — 2002

Bollettino dell'Unione Matematica Italiana

On the lattice $L (C R)$ of varieties of completely regular semigroups considered as algebras with the binary multiplication and unary inversion within maximal subgroups, we study the relations $K_{l}$ , $K$ , $K_{r}$ , $T_{l}$ , $T$ , $T_{r}$ , $C$ and $L$ . Here $K$ is the kernel relation, $T$ is the trace relation, $T_{l}$ and $T_{r}$ are the left and the right trace relations, respectively, $K_{p} = K \cap T_{p}$ for $p \in \{l, r\}$ , $C$ is the core relation and $L$ is the local relation. We give an alternative definition for each of these relations $P$ of the form $U P V \Leftrightarrow U \cap \tilde{P} = V \cap \tilde{P} (U, V \in L (C R)),$ for some subclasses $\tilde{P}$ of $C R$ ....

Certain partial orders on semigroups

Mario Petrich — 2001

Czechoslovak Mathematical Journal

Relations introduced by Conrad, Drazin, Hartwig, Mitsch and Nambooripad are discussed on general, regular, completely semisimple and completely regular semigroups. Special properties of these relations as well as possible coincidence of some of them are investigated in some detail. The properties considered are mainly those of being a partial order or compatibility with multiplication. Coincidences of some of these relations are studied mainly on regular and completely regular semigroups.

On the structure of a class of commutative semigroups

Mario Petrich — 1964

Czechoslovak Mathematical Journal

Prime ideals of the cartesian product of two semigroups

Mario Petrich — 1962

Czechoslovak Mathematical Journal

Page 1 Next

Download Results (CSV)