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COMBINATORICS
2002
13 years 7 months ago
2002
We present generalisations of several MacWilliams type identities, including those by Kl
COMBINATORICS
2002
13 years 7 months ago
2002
We consider the two permutation statistics which count the distinct pairs obtained from the final two terms of occurrences of patterns 1
COMBINATORICS
2002
13 years 7 months ago
2002
We give a short proof of the Littlewood-Richardson rule using a sign-reversing involution.
COMBINATORICS
2002
13 years 7 months ago
2002
We give two lower bound formulas for multicolored Ramsey numbers. These formulas improve the bounds for several small multicolored Ramsey numbers.
COMBINATORICS
2002
13 years 7 months ago
2002
A 321-k-gon-avoiding permutation avoids 321 and the following four patterns: k(k + 2)(k + 3)