Keresés
28 találatból megjelenítve: 11-20
Cím: On the Combinatorics of Symmetrized Poly-Bernoulli Bumbers
Szerző: ;
Dátum: 2021
Feltöltve: 2023-02-16
(2021)
In this paper we introduce three combinatorial models for symmetrized poly- Bernoulli numbers. Based on our models we derive generalizations of some identities for poly-Bernoulli numbers. Finally, we set open questions and ...
Cím: Combinatorial Proof of an Identity on Genocchi Numbers
Szerző: ;
Dátum: 2021
Feltöltve: 2023-02-20
(2021)
In this note we present a combinatorial proof of an identity involving poly-Bernoullinumbers and Genocchi numbers. We introduce combinatorial objects calledm-barredCallan sequences and use them to show that the identity ...
Cím: Mammal Extinction Facilitated Biome Shift and Human Population Change During the Last Glacial Termination in East-Central Europe
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Dátum: 2022
Feltöltve: 2023-02-14
(2022)
"The study of local extinction times, together with the associated environmental and human population changes in the last glacial termination, provides insights into the causes of mega- and microfauna extinctions. In ...
Cím: Set partitions and non-crossing partitions with l-neighbors and l-isolated elements
Szerző: ; ;
Dátum: 2022
Feltöltve: 2023-02-14
(2022)
In this paper we introduce the notion of an -neighbor element of set partitions, that is, an element a in a block that contains +1 consecutive elements, among which is a . Elements that are not -neighbors are called -isolated ...
Cím: Irreproducibility in searches of scientific literature: A comparative analysis
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Dátum: 2021
Feltöltve: 2023-02-16
(2021)
Abstract Repeatability is the cornerstone of science, and it is particularly important for systematic reviews. However, little is known on how researchers? choice of database, and search platform influence the repeatability ...
Cím: Global coarse-grained mesoscale eddy statistics based on integrated kinetic energy and enstrophy correlations
Szerző: ; ; ;
Dátum: 2022
Feltöltve: 2023-02-14
(2022)
"Recently, introduced the concept of a "vortex proxy" based on an observation of strong correlations between integrated kinetic energy and integrated enstrophy over a large enough surface area. When mesoscale vortices are ...
Cím: Weak Ascent Sequences and Related Combinatorial Structures
Szerző: ; ;
Dátum: 2023
Feltöltve: 2023-02-14
(2023)
In this paper we introduce weak ascent sequences, a class of number sequences that properly contains ascent sequences. We show how these sequences uniquely encode each of the following objects: permutations avoiding a ...
Cím: Restricted r-Stirling Numbers and Their Combinatorial Applications
Szerző: ; ; ;
Dátum: 2019
Feltöltve: 2023-02-20
(2019)
We study set partitions with r distinguished elements and block sizes found in an arbitrary index set S . The enumeration of these ( S, r )-partitions leads to the introduc- tion of ( S, r )-Stirling numbers, an extremely ...
Cím: Bijective enumerations of ?-free 0–1 matrices
Szerző: ;
Dátum: 2018
Feltöltve: 2023-02-20
(2018)
We construct a new bijection between the set of n × k 0–1 matrices with no three 1’s forming a ? configuration and the set of ( n, k )-Callan sequences, a simple structure counted by poly-Bernoulli numbers. We give two ...
Cím: Some applications of S-restricted set partitions
Szerző: ;
Dátum: 2019
Feltöltve: 2023-02-20
(2019)
In the paper, the authors present several new relations and applications for the combinatorialsequence that counts the possible partitions of a finite set with the restriction that the size ofeach block is contained in a ...