Nuprl - graph_1_3 LEMMAs for depthfirst

Rank	Theorem	Name
15	Thm* For any graph the_obj:GraphObject(the_graph). paren(V;depthfirst(the_obj)) & no_repeats(V+V;depthfirst(the_obj))	[depthfirst_paren]
cites
14	Thm* For any graph the_obj:GraphObject(the_graph), P:(TraversalProp). P(nil) (s:Traversal, i:V. paren(V;s) no_repeats(V+V;s) P(s) P(dfs(the_obj;s;i))) paren(V;depthfirst(the_obj)) & no_repeats(V+V;depthfirst(the_obj)) & P(depthfirst(the_obj))	[depthfirst_induction2]