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» Combinatorics of diagrams of permutations

15

COMBINATORICS
2006

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A Permutation Regularity Lemma

13 years 9 months ago

A Permutation Regularity Lemma

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We introduce a permutation analogue of the celebrated Szemer

Joshua N. Cooper

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24

COMBINATORICS
2004

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Minuscule Heaps over Dynkin Diagrams of Type A~

13 years 9 months ago

Minuscule Heaps over Dynkin Diagrams of Type A~

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Manabu Hagiwara

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24

COMBINATORICS
2002

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The Minimum Number of Monotone Subsequences

13 years 9 months ago

The Minimum Number of Monotone Subsequences

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Erdos and Szekeres showed that any permutation of length n k2 + 1 contains

Joseph Samuel Myers

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18

COMBINATORICS
2004

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An Answer to a Question by Wilf on Packing Distinct Patterns in a Permutation

13 years 9 months ago

An Answer to a Question by Wilf on Packing Distinct Patterns in a Permutation

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We present a class of permutations for which the number of distinctly ordered subsequences of each permutation approaches an almost optimal value as the length of the permutation ...

Micah Coleman

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10

COMBINATORICS
2002

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321-Polygon-Avoiding Permutations and Chebyshev Polynomials

13 years 9 months ago

321-Polygon-Avoiding Permutations and Chebyshev Polynomials

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A 321-k-gon-avoiding permutation avoids 321 and the following four patterns: k(k + 2)(k + 3)

Toufik Mansour, Zvezdelina Stankova

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