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65
Voted
COMBINATORICS
2006
15 years 20 days ago
2006
We introduce a permutation analogue of the celebrated Szemer
93
Voted
COMBINATORICS
2004
15 years 14 days ago
2004
80
Voted
COMBINATORICS
2002
15 years 13 days ago
2002
Erdos and Szekeres showed that any permutation of length n k2 + 1 contains
93
Voted
COMBINATORICS
2004
15 years 14 days ago
2004
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 ...
56
Voted
COMBINATORICS
2002
15 years 13 days ago
2002
A 321-k-gon-avoiding permutation avoids 321 and the following four patterns: k(k + 2)(k + 3)