Results 101 to 110 of about 1,225 (183)
On Centralizers of Finite Lattices and Semilattices [PDF]
, 2021 We study centralizer clones of finite lattices and semilattices. For semilattices, we give two characterizations of the centralizer and also derive formulas for the number of operations of a given essential arity in the centralizer.
Waldhauser Tamás, Tóth Endre
core
Elementary theories for Rogers semilattices [PDF]
, 2005 It is proved that for every level of the arithmetic hierarchy, there exist infinitely many families of sets with pairwise non-elementarily equivalent Rogers ...
SORBI, ANDREA, Goncharov S., Badaev S.
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On iterated semidirect products of finite semilattices [PDF]
, 1991 Let Sl denote the class of all finite semilattices and let Sln be the pseudovariety of semigroups generated by all semidirect products of n finite Semilattices.
Almeida, Jorge
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Topological and ditopological unosemigroups [PDF]
Математичні Студії, 2013 In this paper we introduce and study a new topologo-algebraic structure called a (di)topological unosemigroup. This is a topological semigroup endowed with continuous unary operations of left and right units (which have certain continuous division ...
T. Banakh, I. Pastukhova
doaj
The semigroup of varieties of Brouwerian semilattices [PDF]
, 1978 It is shown that the semigroup of varieties of Brouwerian semilattices is free.
Peter Köhler
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ALGORITHMIC PROPERTIES OF ROGERS SEMILATTICES [PDF]
The thesis uses various approaches to explore the algorithmic complexity of families of subsets of natural numbers. One of these approaches involves investigating upper semilattices of computable numberings of a given family and their complexity in ...
Tleuliyeva, Zhansaya
core
Isomorphism types and theories of Rogers semilattices of arithmetical numberings [PDF]
, 2003 We investigate differences in isomorphism types and elementary theories of Rogers semilattices of arithmetical numberings, depending on different levels of the arithmetical hierarchy.
Andrea Sorbi +5 more
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Implication in finite posets with pseudocomplemented sections. [PDF]
Soft comput, 2022 Chajda I, Länger H.
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Principal congruences of pseudocomplemented semilattices and congruence extension property [PDF]
, 1979 Principal congruences of pseudocomplemented semilattices are characterized and shown to be definable. This characterization is then applied to give a new proof of the fact that the variety of pseudocomplemented semilattices has the congruence extension ...
H. P. Sankappanavar
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