> In a sense, trees are everywhere, whenever you deal with a
> hierarchical order:
> 1. in order theory and set theory, the tree structure makes a
> special kind of partial order;
> 2. in graph theory, it makes a connected acyclic graph, undirected
> or directed; (01)
As John originally noted, additional conditions are needed in the case
of directed trees. (02)
-chris (03)
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