Click any two or three leaves
Click leaves to select them. Two leaves = distance comparison. Three leaves = triadic rigidity test.
Cophenetic Distance
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Depth of common ancestor (tree distance)
Ultrametric Distance
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Strong triangle inequality: d(x,z) ≤ max{d(x,y), d(y,z)}
Euclidean Distance
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What the distance would be in ℝ²
Triadic Rigidity
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In ultrametric space: the two largest of three distances are ALWAYS equal