Def lpath(p)
Def == i:(||p||-1). 
Def == destination(p[i]) = source(p[(i+1)]) & p[(i+1)] = lnk-inv(p[i])  IdLnk

is mentioned by

Thm* T:(Id), to,from:(|T|(IdLnk List)). Thm* bi-tree(T;to;from)  (n:. p:Edge(T) List. lpath(p)  ||p||n)

[bi-tree-diameter]

In prior sections: mb event system 2

Try larger context: EventSystems IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html