Definitionintro
Derangement
Also called Derangements, derangement number, fixed-point-free permutation, fixed-point-free permutations, subfactorial.
A permutation with no fixed points; their count is about n!/e.
A permutation with no fixed points; their count is about n!/e.
About this page
The build computes these levels from the evidence in the repository. Each row says what the next level needs. Read what the levels mean.
| Ladder | Level | What the next level needs |
|---|---|---|
| Human proof | H0 no proof |
|
| Lean | L0 no Lean part |
|
| Visual | V0 none |
|
| Writing | W0 stub |
|
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