Theoremcore
Four-point condition
Also called Buneman's theorem.
A metric is a tree metric exactly when every four points satisfy the largest two of three pair sums being equal.
A metric is a tree metric exactly when every four points satisfy the largest two of three pair sums being equal.
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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