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JCT
2008
15 years 3 months ago
2008
Given sets X and Y of positive integers and a permutation = 12
110
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COMBINATORICS
2006
15 years 3 months ago
2006
In [5] the authors refine the well-known permutation statistic "descent" by fixing parity of one of the descent's numbers. In this paper, we generalize the results o...