Editing List of graph theory topics (section)

=== Operations ===

{{columns-list|colwidth=30em|

*[[Tree rotation]]
*[[Tree traversal]]
**[[Inorder traversal]]
**[[Backward inorder traversal]]
**[[Pre-order traversal]]
**[[Post-order traversal]]
**[[Ahnentafel]]
*[[Tree search algorithm]]
*[[A-star search algorithm]]
*[[Best-first search]]
*[[Breadth-first search]]
*[[Depth-first search]]
**[[Iterative deepening depth-first search]]
}}

*[[Tree structure]]
*[[Tree data structure]]
*[[Cayley's formula]]
*[[Kőnig's lemma]]
*[[Tree (set theory)]] (need not be a tree in the graph-theory sense, because there may not be a unique path between two vertices)
*[[Tree (descriptive set theory)]]
*[[Euler tour technique]]