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123
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COMBINATORICS
2004
15 years 3 months 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 ...
132
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CPC
2000
15 years 3 months ago
2000
Answering a question of Wilf, we show that if n is sufficiently large, then one cannot cover an n