mb event system 2 Sections EventSystems Doc
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Def last(L) == L[(||L||-1)]

is mentioned by

Def lconnects(p;i;j)
Def == lpath(p)
Def == & (||p|| = 0    i = j  Id)
Def == & (||p|| = 0    i = source(hd(p)) & j = destination(last(p)))
[lconnects]

In prior sections: mb list 1 mb list 2 mb event system 1

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mb event system 2 Sections EventSystems Doc