Results 81 to 90 of about 162,256 (241)

A Survey of Alternating Permutations [PDF]

open access: yes, 2009
This survey of alternating permutations and Euler numbers includes refinements of Euler numbers, other occurrences of Euler numbers, longest alternating subsequences, umbral enumeration of classes of alternating permutations, and the cd-index of the ...
Stanley, Richard P.
core   +1 more source

Counting king permutations on the cylinder [PDF]

open access: yesEnumerative Combinatorics and Applications, 2022
Eli Bagno   +3 more
doaj   +1 more source

Enumerative properties of generalized associahedra

open access: yes, 2004
Some enumerative aspects of the fans, called generalized associahedra, introduced by S. Fomin and A. Zelevinsky in their theory of cluster algebras are considered, in relation with a bicomplex and its two spectral sequences.
Chapoton, Frederic
core   +3 more sources

q-Enumeration of type B and type D Eulerian polynomials based on parity of descents [PDF]

open access: yesEnumerative Combinatorics and Applications, 2023
Hiranya Kishore Dey   +2 more
doaj   +1 more source

Enumerative combinatorics on words [PDF]

open access: yes, 2001
Generating series, also called generating functions, play an important role in combinatorial mathematics. Many enumeration problems can be solved by transferring the basic operations on sets into algebraic operations on formal series leading to a solution of an enumeration problem.
openaire   +2 more sources

Highly sorted permutations with respect to a 312-avoiding stack [PDF]

open access: yesEnumerative Combinatorics and Applications, 2023
Yuji Choi, Yunseo Choi
doaj   +1 more source

Restricted Grassmannian permutations [PDF]

open access: yesEnumerative Combinatorics and Applications, 2022
Juan B. Gil, Jessica A. Tomasko
doaj   +1 more source

Fundamental polytopes of metric trees via parallel connections of matroids

open access: yes, 2019
We tackle the problem of a combinatorial classification of finite metric spaces via their fundamental polytopes, as suggested by Vershik in 2010. In this paper we consider a hyperplane arrangement associated to every split pseudometric and, for tree-like
Delucchi, Emanuele, Hoessly, Linard
core  

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