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References to 'root (of a tree)'
1. balanced tree by Mathprof
2. binary tree by Daume
3. branch by Henry
4. child node (of a tree) by akrowne
5. directed graph by rm50
6. example of resultant (2) by rspuzio
7. K\"onig's lemma by mps
8. parent node (in a tree) by akrowne
9. Pietro Cataldi by Mravinci
10. proof of algebraic independence of elementary symmetric polynomials by lalberti
11. things counted by the Catalan numbers by rm50
12. tree by Logan
13. tree traversals by mps
14. trie by mathcam
15. Wedderburn-Etherington number by PrimeFan
16. weight-balanced binary trees are ultrametric by mathcam
17. weighted path length by Logan