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References to 'distance (in a graph)'
1. child node (of a tree) by akrowne
2. chromatic number of a metric space by Mathprof
3. circle line picking by PrimeFan
4. diameter by marijke
5. finite projective plane by Mathprof
6. Hamming distance by Mathprof
7. Hamming metric by drini
8. Moore graphs of $d=2$ are $v$-valent and order is $v^2+1$ by marijke
9. projective plane by yark
10. root (of a tree) by akrowne
11. weight-balanced binary trees are ultrametric by mathcam
12. weighted path length by Logan