t:Graph. Vertices(t) 
Type
e:Type(e
vv)Top Type{i'}T:Type, L:T List. 
null(L) 
last(L) T| Some definitions of interest. | |
| gr_v | Def Vertices(t) == 1of(t) |
| Thm* t:Graph. Vertices(t) Type | |
| graph | Def Graph == v:Typee:Type(evv)Top |
| Thm* Graph Type{i'} | |
| last | Def last(L) == L[(||L||-1)] |
| Thm* T:Type, L:T List. null(L) last(L) T |
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