نتایج جستجو برای: union closed sets conjecture

تعداد نتایج: 414131  

Journal: :bulletin of the iranian mathematical society 2011
m. caldas s. jafari r. k. saraf

2006
Valeriu Soltan

Let SH denote the homothety class generated by a convex set S ⊂ R: SH = {a + λS | a ∈ R, λ > 0}. We determine conditions for the Minkowski sum BH + CH or the Minkowski difference BH ∼ CH of homothety classes BH and CH generated by closed convex sets B,C ⊂ R to lie in a homothety class generated by a closed convex set (more generally, in the union of countably many homothety classes generated by...

Journal: :J. Comb. Theory, Ser. A 2011
David Ellis Benny Sudakov

If X is an n-element set, we call a family G ⊂ PX a k-generator for X if every x ⊂ X can be expressed as a union of at most k disjoint sets in G. Frein, Lévêque and Sebő [10] conjectured that for n > 2k, the smallest k-generators for X are obtained by taking a partition of X into classes of sizes as equal as possible, and taking the union of the power-sets of the classes. We prove this conjectu...

Journal: :bulletin of the iranian mathematical society 0
h. ansari-toroghy department of pure mathematics‎, ‎faculty of mathematical sciences‎, ‎university of guilan‎, ‎p.o‎. ‎box 41335-19141‎, ‎rasht‎, ‎iran. r. ovlyaee-sarmazdeh department of pure mathematics‎, ‎faculty of mathematical sciences‎, ‎university of guilan‎, ‎p.o‎. ‎box 41335-19141‎, ‎rasht‎, ‎iran. seyed sajad pourmortazavi department of pure mathematics‎, ‎faculty of mathematical sciences‎, ‎university of guilan‎, ‎p‎. ‎o‎. ‎box 41335-19141 rasht‎, ‎iran.

let $r$ be an associative ring and let $m$ be a left $r$-module.let $spec_{r}(m)$ be the collection of all prime submodules of $m$ (equipped with classical zariski topology). there is a conjecture which says that every irreducible closed subset of $spec_{r}(m)$ has a generic point. in this article we give an affirmative answer to this conjecture and show that if $m$ has a noetherian spectrum, t...

The main purpose of this paper is to introduce and study new classes of soft closed sets like soft regular generalized b-closed sets in soft topological spaces (briefly soft rgb-closed set) Moreover, soft rg-closed, soft gpr-closed, soft gb-closed, soft gsp-closed, soft g$alpha$-closed, soft g$alpha$b-closed, and soft sgb-closed sets in soft topological spaces are introduced in this paper and w...

Journal: :Inf. Process. Lett. 1987
Yoshihito Toyama

The direct sum of two term rewriting systems is the union of systems having disjoint sets of function symbols. It is shown that the direct sum of two term rewriting systems is not terminating, even if these systems are both terminating. Keyword: Term rewriting system, termination Introduction A term rewriting system R is a set of rewriting rules M → N , where M and N are terms [1, 3, 5]. The di...

Let $R$ be an associative ring and let $M$ be a left $R$-module.Let $Spec_{R}(M)$ be the collection of all prime submodules of $M$ (equipped with classical Zariski topology). There is a conjecture which says that every irreducible closed subset of $Spec_{R}(M)$ has a generic point. In this article we give an affirmative answer to this conjecture and show that if $M$ has a Noetherian spectrum, t...

2016
DRAGOS GHIOCA

Let K be an algebraically closed field of prime characteristic p, let N ∈ N, let Φ : Gm −→ Gm be a self-map defined over K, let V ⊂ Gm be a curve defined over K, and let α ∈ Gm(K). We show that the set S = {n ∈ N : Φn(α) ∈ V } is a union of finitely many arithmetic progressions, along with a finite set and finitely many p-arithmetic sequences, which are sets of the form {a+ bpkn : n ∈ N} for so...

Journal: :ISRN Geometry 2012

Journal: :Journal of Taibah University for Science 2017

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید