Results 61 to 70 of about 1,323,506 (183)

Strongly bounded groups and infinite powers of finite groups

, 2006
We define a group as strongly bounded if every isometric action on a metric space has bounded orbits. This latter property is equivalent to the so-called uncountable strong cofinality, recently introduced by G. Bergman.
Bridson M. R., de la Harpe P., Koppelberg S., Lyndon R. C., Sabbagh G., Serre J.-P, Yves de Cornulier   +6 more
core   +2 more sources

Lower bounds on blocking sets [PDF]

Pacific Journal of Mathematics, 1985
The author obtains lower bounds for the number of elements in blocking sets in inversive and projective planes. He extends the notion of blocking sets to families of disjoint subspaces and obtains a lower bound for the number of elements in a maximal partial spread of m-spaces in projective \((2m+1)\)-space.
Bruen, A. A., Rothschild, B. L.
openaire   +3 more sources

Simple closed curves contained in ε-boundaries of planar sets

Applied General Topology
The ε-boundary of a set A ⊆ R2 is the set { p ∈ R2 : ρ(p,A) = ε } , where ρ is the Euclidean distance. We prove that if A,B ⊆ R2 are nonempty, connected sets, A is bounded, and 0< ε < ρ(A,B), then the ε-boundary of A contains a simple closed curve (aka a
Mikhail Patrakeev, Aleksei Volkov
doaj   +1 more source

Bounds on the non-real spectrum of differential operators with indefinite weights [PDF]

, 2012
Ordinary and partial differential operators with an indefinite weight function can be viewed as bounded perturbations of non-negative operators in Krein spaces.
Behrndt, Jussi, Philipp, Friedrich, Trunk, Carsten   +2 more
core   +1 more source

Action Theory of Fuzzy Bornological Groups

Academic Science Journal
This paper explores the action theory of fuzzy bornological groups. We investigate the scenario where a fuzzy bornological group  acts on a fuzzy bornological set  such that the action map    is fuzzy bounded.
Anwar Imran
doaj   +1 more source

A note on the relationship between three classes of operators on Riesz spaces

Annals of the West University of Timisoara: Mathematics and Computer Science, 2019
Following several papers in the prior literature, we study the relationship between order bounded operators, topologically bounded operators and topologically continuous operators.
Hong Liang
doaj   +1 more source

Lower bound for balanced sets

Theoretical Computer Science, 2012
Let \(S\) be a non-empty subset of \(\mathbb Z/p\mathbb Z\), where \(p\) is an odd prime. We call \(S\) \textit{balanced} if for every \(x \in S\) there are distinct elements \(y, z \in S\) such that \(x = (y+z)/2\). This is a curious condition that arises in combinatorial game theory but appears to be of independent interest.
openaire   +1 more source

Proximinality in geodesic spaces

Abstract and Applied Analysis, 2006
Let X be a complete CAT(0) space with the geodesic extension property and Alexandrov curvature bounded below. It is shown that if C is a closed subset of X, then the set of points of X which have a unique nearest point in C is Gδ and of the second Baire ...
A. Kaewcharoen, W. A. Kirk
doaj   +1 more source

Bounds for Greedy $B_h$-Sets

The Electronic Journal of Combinatorics
A set ${\cal A}$ of nonnegative integers is called a $B_h$-set if every solution to\(a_1+\dots+a_h = b_1+\dots+b_h\), where $a_i,b_i \in {\cal A}$,has $\{a_1,\dots,a_h\}=\{b_1,\dots,b_h\}$ (as multisets). Let $\gamma_k(h)$ be the $k$-th positive element of the greedy $B_h$-set.
openaire   +3 more sources

New bounds for contagious sets

Discrete Mathematics, 2012
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +1 more source