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Rencontres numbers are a sequence of integers that arise in combinatorial mathematics, specifically in the context of permutations. They count the number of permutations of a set of \( n \) elements where exactly \( k \) elements are in their original (or "fixed") positions. The term "rencontre" comes from a French word meaning "meeting," reflecting the idea of elements meeting their original positions.

Ancestors (5)

  1. Permutations
  2. Combinatorics
  3. Fields of mathematics
  4. Mathematics
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