Results 81 to 90 of about 298 (187)

Topics in Semigroups

open access: yes, 1967
The semigroup theories of fundamental importance were discovered in 1928 with the publication of a paper by A. K. Suschkewitsch. The paper is included in the only book published prior to 1961 dealing primarily with the algebraic theory of semigroups. The
Jenson, Merlin Ray
core   +2 more sources

The Translational Hull of a Semilattice of Weakly Reductive Semigroups

open access: yes, 1974
The translational hull is of central importance in the construction of ideal extensions and the study of densely embedded ideals particularly for weakly reductive semigroups (see [4, Chapter III]).
Mario Petrich
core   +1 more source

On additive bases in infinite abelian semigroups

open access: yes, 2023
Building on previous work by Lambert, Plagne and the third author, we study various aspects of the behavior of additive bases in infinite abelian groups and semigroups.
Girard, Benjamin   +2 more
core   +2 more sources

Generalized absolute values, ideals and homomorphisms in mixed lattice groups [PDF]

open access: yes, 2020
A mixed lattice group is a generalization of a lattice ordered group. The theory of mixed lattice semigroups dates back to the 1970s, but the corresponding theory for groups and vector spaces has been relatively unexplored.
Eriksson, Sirkka-Liisa   +2 more
core   +1 more source

Semigroups satisfying variable identities. II

open access: yes, 1972
The concept of a semigroup satisfying an identity x y = f ( x , y ) xy = f(x,y) is generalized by considering identities in n n -variables and letting the ...
Julian Weissglass, Mohan S. Putcha
core   +1 more source

Positive semigroups generated by elliptic operators on Lie groups

open access: yes, 2016
The authors generalize first of all a characterization of second order strongly elliptic differential operators given by \textit{S. Miyajima} and \textit{N. Okazawa} [Pac. J. Math. 125, 161-175 (1986; Zbl 0615.47031)]. Secondly they derive reuslts on the asymptotic behaviour of the semigroup generated by such an operator.
Arendt, W, Batty, C, Robinson, D
openaire   +2 more sources

KNITTED SEMILATTIC STRUCTURE OF REGULAR ${\cal H}^\dag$-CYBER GROUPS

open access: yes, 2011
We consider regular [Formula: see text]-cyber groups in the class of [Formula: see text]-abundant semigroups. By using knitted semilattice of semigroups, we give some structure theorems for regular [Formula: see text]-cyber groups, right quasi-normal ...
Xiangzhi Kong, Yu Su
core   +1 more source

Theorems of Birkhoff type in pseudovarieties and e-varieties of regular semi-groups

open access: yes, 1998
This thesis is concerned with the problem of being able to use, or generalize, Birkhoff's fundamental theorems for classes of algebras which do not form varieties - particularly in pseudovarieties and e-varieties.
Churchill, Genevieve (15933056)
core   +1 more source

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