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86
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DM
2008
70views more  DM 2008»
15 years 27 days ago
Enumeration of (k, 2)-noncrossing partitions
A set partition is said to be (k, d)-noncrossing if it avoids the pattern 12
Toufik Mansour, Simone Severini
64
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DM
2006
70views more  DM 2006»
15 years 25 days ago
Improving probability bounds by optimization over subsets
The simple device of maximization over subsets of events can provide substantial improvement over the Dawson
Fred M. Hoppe
69
Voted
DM
2006
60views more  DM 2006»
15 years 25 days ago
Extended directed triple systems
Let {v; b2, b1} denote the class of extended directed triple systems of the order v in which the number of blocks of the form [a, b, a] is b2 and
Wen-Chung Huang
78
Voted
DM
2006
99views more  DM 2006»
15 years 25 days ago
Bias matroids with unique graphical representations
Given a 3-connected biased graph with three node-disjoint unbalanced circles, at most one of which is a loop, we describe how the bias matroid of is uniquely represented by .
Daniel C. Slilaty
86
Voted
DM
2006
65views more  DM 2006»
15 years 25 days ago
Hex and combinatorics
We explain some analytic methods that can be useful in solving Hex puzzles.
Ryan B. Hayward, Jack van Rijswijck