Results 51 to 60 of about 69,347 (192)

Extended Rate, more GFUN [PDF]

open access: yesDiscrete Mathematics & Theoretical Computer Science, 2006
We present a software package that guesses formulas for sequences of, for example, rational numbers or rational functions, given the first few terms.
Martin Rubey
doaj   +1 more source

Agrárpiaci Jelentések Gabona és ipari növények [PDF]

open access: yes, 2011
Source at https://journalofmathematicsandculture.wordpress.com/2017/12/28/journal-of-mathematics-and-culture-volume-11-number-4/.A group of Sámi middle school mathematics teachers cooperated with researchers over a period of three years in investigating
Børresen, Tove   +7 more
core   +1 more source

New bounds for equiangular lines

open access: yes, 2014
A set of lines in $\mathbb{R}^n$ is called equiangular if the angle between each pair of lines is the same. We address the question of determining the maximum size of equiangular line sets in $\mathbb{R}^n$, using semidefinite programming to improve the ...
Barg, Alexander, Yu, Wei-Hsuan
core   +1 more source

Some local--global phenomena in locally finite graphs

open access: yes, 2020
In this paper we present some results for a connected infinite graph $G$ with finite degrees where the properties of balls of small radii guarantee the existence of some Hamiltonian and connectivity properties of $G$. (For a vertex $w$ of a graph $G$ the
Asratian, Armen S.   +2 more
core   +1 more source

Cluster‐Randomized Trials in Emergency Care Research

open access: yesAcademic Emergency Medicine, EarlyView.
ABSTRACT Objective Cluster‐randomized trials (also called group‐randomized trials) are increasingly common in emergency care research. In such trials, groups of participants are allocated to different interventions based on naturally occurring “clusters,” such as clinics, hospitals, or emergency medical services agencies. In this methodological review,
Howard S. Kim   +2 more
wiley   +1 more source

The first ascent of size $d$ or more in compositions [PDF]

open access: yesDiscrete Mathematics & Theoretical Computer Science, 2006
A composition of a positive integer $n$ is a finite sequence of positive integers $a_1, a_2, \ldots, a_k$ such that $a_1+a_2+ \cdots +a_k=n$. Let $d$ be a fixed nonnegative integer.
Charlotte Brennan, Arnold Knopfmacher
doaj   +1 more source

A complex network perspective on brain disease

open access: yesBiological Reviews, EarlyView.
ABSTRACT If brain anatomy and dynamics have a complex network structure as it has become standard to posit, it is reasonable to assume that such a structure should play a key role not only in brain function but also in brain dysfunction. However, exactly how network structure is implicated in brain damage and whether at least some pathologies can be ...
David Papo, Javier M. Buldú
wiley   +1 more source

On the set of Fixed Points of the Parallel Symmetric Sand Pile Model [PDF]

open access: yesDiscrete Mathematics & Theoretical Computer Science, 2011
Sand Pile Models are discrete dynamical systems emphasizing the phenomenon of $\textit{Self-Organized Criticality}$. From a configuration composed of a finite number of stacked grains, we apply on every possible positions (in parallel) two grain moving ...
Kévin Perrot   +2 more
doaj   +1 more source

Combinatorics and Geometry of Transportation Polytopes: An Update [PDF]

open access: yes, 2013
A transportation polytope consists of all multidimensional arrays or tables of non-negative real numbers that satisfy certain sum conditions on subsets of the entries.
De Loera, Jesús A., Kim, Edward D.
core  

Further applications of the Container Method

open access: yes, 2016
Recently, Balogh--Morris--Samotij and Saxton--Thomason proved that hypergraphs satisfying some natural conditions have only few independent sets. Their main results already have several applications.
Balogh, Jozsef, Wagner, Adam Zsolt
core   +1 more source

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