Results 181 to 190 of about 10,642 (232)
Some of the next articles are maybe not open access.
HNN EXTENSIONS OF SEMILATTICES
International Journal of Algebra and Computation, 1999The main purpose of this paper is to investigate properties of an HNN extension of a semilattice, to give its equivalent characterizations and to discuss similarities with free groups. An HNN extension of a semilattice is shown to be a universal object in a certain category and an F-inverse cover over a free group for every inverse semigroup in the ...
openaire +2 more sources
Order, 1991
The concept of a median semilattice is generalized in the following way: a meet semilattice \(S\) is called \(n\)-median semilattice iff all principal ideals in \(S\) are distributive lattices and any \(n\)-element subset of \(S\) has an upper bound whenever each of its \((n-1)\)-element subsets has an upper bound.
Bandelt, Hans-Jürgen +2 more
openaire +2 more sources
The concept of a median semilattice is generalized in the following way: a meet semilattice \(S\) is called \(n\)-median semilattice iff all principal ideals in \(S\) are distributive lattices and any \(n\)-element subset of \(S\) has an upper bound whenever each of its \((n-1)\)-element subsets has an upper bound.
Bandelt, Hans-Jürgen +2 more
openaire +2 more sources
SEMILATTICES AND THE RAMSEY PROPERTY
The Journal of Symbolic Logic, 2015AbstractWe consider${\cal S}$, the class of finite semilattices;${\cal T}$, the class of finite treeable semilattices; and${{\cal T}_m}$, the subclass of${\cal T}$which contains trees with branching bounded bym. We prove that${\cal E}{\cal S}$, the class of finite lattices with linear extensions, is a Ramsey class.
openaire +1 more source
On filters of implicative semilattices
Information Sciences, 2002zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire +1 more source
Amenability constants for semilattice algebras
, 2007For any finite commutative idempotent semigroup S, a semilattice, we show how to compute the amenability constant of its semigroup algebra ℓ1(S). This amenability constant is always of the form 4n+1.
M. Ghandehari, Hamed Hatami, N. Spronk
semanticscholar +1 more source
DISTRIBUTIVE PSEUDOCOMPLEMENTED SEMILATTICES
Asian-European Journal of Mathematics, 2010In this paper we will extend the topological duality given in [1] to the class of distributive pseudocomplemented semilattices and to the class of distributive Stone semilattices.
openaire +1 more source
Pseudocomplemented and Implicative Semilattices
Canadian Journal of Mathematics, 1982Let L be a semilattice and let a ∊ L. We refer the reader to Definitions 2.2, 2.4, 2.5 and 2.12 below for the terminology. If L is a-implicative, let Ca be the set of a-closed elements of L, and let Da be the filter of a-dense elements of L. Then Ca is a Boolean algebra. If a = 0, then C0 and D0 are the usual closed algebra and dense filter of L.
openaire +1 more source
Journal of Mathematical Sciences, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire +1 more source
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire +1 more source
The Free Distributive Semilattice Extension of a Distributive Poset
Order, 2018L. J. González
semanticscholar +1 more source
Meet-Semilattice Congruences on a Frame
Applied Categorical Structures, 2018J. Frith, A. Schauerte
semanticscholar +1 more source