Results 1 to 10 of about 71,665 (219)

Współczesne zabory – narody bezpaństwowe podzielone granicami [PDF]

Przegląd Geopolityczny
The study contains the results of a geopolitical cartographic and linguistic analysis of the situation of stateless nations and ethnic groups. The aim of the analysis was to create a complete list of nations whose countries are divided by a modern ...
Piotr L. Wilczyński
doaj  

Magnifiers in Some Generalization of the Full Transformation Semigroups

Mathematics, 2020
An element a of a semigroup S is called a left [right] magnifier if there exists a proper subset M of S such that a M = S ( M a = S ) .
Thananya Kaewnoi, Montakarn Petapirak, Ronnason Chinram   +2 more
doaj   +1 more source

On Macrostates in Complex Multi-Scale Systems

Entropy, 2016
A characteristic feature of complex systems is their deep structure, meaning that the definition of their states and observables depends on the level, or the scale, at which the system is considered.
Harald Atmanspacher
doaj   +1 more source

A note on the exact formulas for certain $2$-color partitions

Comptes Rendus. Mathématique
Let $p\le 23$ be a prime and $a_p(n)$ count the number of partitions of $n$ where parts that are multiple of $p$ come up with $2$ colors. Using a result of Sussman, we derive the exact formula for $a_p(n)$ and obtain an asymptotic formula for $\log a_p(n)
Guadalupe, Russelle
doaj   +1 more source

Sum rules for permutations with fixed points involving Stirling numbers of the first kind

Indonesian Journal of Combinatorics
We propose sum rules for permutations pn(k) of the ensemble {1,2,...,n} with k fixed points, in the form of partial sums of their moments. The corresponding identities involve Stirling numbers of the first kind s(q,r).
Jean-Christophe Pain
doaj   +1 more source

A worldwide coastal analysis of the climate wave systems

Frontiers in Marine Science
Wind generated waves of a sea state are generally the result of the superposition of wind sea and swells, making the frequency-direction wave energy distribution crucial for comprehending this behavior.
Ottavio Mattia Mazzaretto, Melisa Menendez, Melisa Menendez   +2 more
doaj   +1 more source

A simple proof of Pitman–Yor’s Chinese restaurant process from its stick-breaking representation

Dependence Modeling, 2019
For a long time, the Dirichlet process has been the gold standard discrete random measure in Bayesian nonparametrics. The Pitman-Yor process provides a simple and mathematically tractable generalization, allowing for a very flexible control of the ...
Lawless Caroline, Arbel Julyan
doaj   +1 more source

Generalized Beatty sequences

International Journal of Mathematics and Mathematical Sciences, 1978
A well-known result due to S. Beatty is that if α and β are positive irrational numbers satisfying α−1+β−1=1 then each positive integer is to be found in precisely one of the sequences {[kα]}, {[kβ]}(k=1,2,3,…) where [x] denotes the integral part of x ...
A. McD. Mercer
doaj   +1 more source

Building external partitions assesment using multi-criteria decision making methods / Išorinių pastato atitvarų vertinimas taikant daugiakriterinius metodus

Mokslas: Lietuvos Ateitis, 2011
The paper presents a model for selection of building’s external elements. Were analyzed 6 variations of walls and windows area ratio. The authors determined the criteria of those alternatives, which are as follows: heat losses through the building ...
Milena Medineckienė, Modestas Kračka
doaj   +1 more source

Information and Self-Organization

Entropy, 2016
The process of “self-organization” takes place in open and complex systems that acquire spatio-temporal or functional structures without specific ordering instructions from the outside. [...]
Hermann Haken, Juval Portugali
doaj   +1 more source