Math 2.0

concept

Derangement

Summary

A derangement is a permutation that moves every element. Derangements answer the classical hat-check problem, and their number is a standard application of inclusion and exclusion. The node derangement gives the precise definition.

What this node needs for W2
  • edge instance_of in: at least two examples (0 of 2)
  • edge not_instance_of in: at least one non-example (0 of 1)
  • edge specializes both: the more general notions and the special cases (0 of 1)

The writing levels say how complete the text of a node is. They do not measure its truth.

Sources

  1. Web https://en.wikipedia.org/wiki/Derangement, lead section

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Definitions