Counting Permutations by Their Rigid Pat
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A.N Myers
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Article
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2002
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Elsevier Science
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English
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In how many permutations does the pattern t occur exactly m times? In most cases, the answer is unknown. When we search for rigid patterns, on the other hand, we obtain exact formulas for the solution, in all cases considered. # 2002 Elsevier Science (USA)