Conceptcore
Lehmer code
Also called inversion sequence, inversion table code, permutation code.
Encodes a permutation as a sequence where entry i counts smaller elements to its right.
Encodes a permutation as a sequence where entry i counts smaller elements to its right.
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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