Results 51 to 60 of about 145 (113)

Enumeration of super-strong Wilf equivalence classes of permutations in the generalized factor order [PDF]

Discrete Mathematics & Theoretical Computer Science, 2019
Super-strong Wilf equivalence classes of the symmetric group ${\mathcal S}_n$ on $n$ letters, with respect to the generalized factor order, were shown by Hadjiloucas, Michos and Savvidou (2018) to be in bijection with pyramidal sequences of consecutive ...
Ioannis Michos, Christina Savvidou
doaj   +1 more source

On (3, 1)-absorbing primary ideals in commutative rings

Open Mathematics
In this paper, we introduce and study the class of (3, 1)-absorbing primary ideals in commutative rings. We establish several characterizations and examine their relationship with classical 1-absorbing primary ideals.
Abouhalaka Alaa, Kim Hwankoo
doaj   +1 more source

Zeros distribution and interlacing property for certain polynomial sequences

Open Mathematics
In this article, we first prove that the Hankel determinant of order three of the polynomial sequence {Pn(x)=∑k≥0P(n,k)xk}n≥0{\left\{{P}_{n}\left(x)={\sum }_{k\ge 0}P\left(n,k){x}^{k}\right\}}_{n\ge 0} is weakly (Hurwitz) stable, where P(n,k)P\left(n,k ...
Guo Wan-Ming
doaj   +1 more source

Further results on enumeration of perfect matchings of Cartesian product graphs

Open Mathematics
Counting perfect matchings is an interesting and challenging combinatorial task. It has important applications in statistical physics and chemistry. As the general problem is #P-complete, it is usually tackled by randomized heuristics and approximation ...
Wu Tingzeng, Zeng Xiaolin
doaj   +1 more source

Sequences in overpartitions. [PDF]

Ramanujan J, 2023
Andrews GE, Uncu AK.
europepmc   +1 more source

Two-sided permutation statistics via symmetric functions

Forum of Mathematics, Sigma
Given a permutation statistic $\operatorname {\mathrm {st}}$ , define its inverse statistic $\operatorname {\mathrm {ist}}$ by . We give a general approach, based on the theory of symmetric functions, for finding the joint distribution of
Ira M. Gessel, Yan Zhuang
doaj   +1 more source

On the critical exponents of generalized ballot sequences in three dimensions and large tandem walks. [PDF]

Aequ Math, 2022
Wallner M.
europepmc   +1 more source

Asymptotic study of electrorheological fluid in thin domain with variable power-law and Tresca boundary condition

Demonstratio Mathematica
This article investigates the stationary behavior of an incompressible non-Newtonian fluid flowing through a thin three-dimensional domain Qξ⊂R3 ${Q}^{\xi }\subset {\mathbb{R}}^{3}$ , where the viscosity follows a variable power-law model.
Amara Kaddouri, Dilmi Mohamed, Dilmi Mourad, Boulaaras Salah, Benseridi Hamid   +4 more
doaj   +1 more source

The slice decomposition of planar hypermaps

Forum of Mathematics, Sigma
The slice decomposition is a bijective method for enumerating planar maps (graphs embedded in the sphere) with control over face degrees. In this paper, we extend the slice decomposition to the richer setting of hypermaps, naturally interpreted as ...
Marie Albenque, Jérémie Bouttier
doaj   +1 more source

Subspace profiles over finite fields and q-Whittaker expansions of symmetric functions

Forum of Mathematics, Sigma
Bender, Coley, Robbins, and Rumsey posed the problem of counting the number of subspaces which have a given profile with respect to a linear endomorphism defined on a finite vector space.
Samrith Ram
doaj   +1 more source