t:Graph. Vertices(t) 
TypeA:Type, B:(A
Type), p:(a:A
B(a)). 1of(p) A| Who Cites gr v? | |
| gr_v | Def Vertices(t) == 1of(t) |
| Thm* t:Graph. Vertices(t) Type | |
| pi1 | Def 1of(t) == t.1 |
| Thm* A:Type, B:(AType), p:(a:AB(a)). 1of(p) A |
| Syntax: | Vertices(t) | has structure: | gr_v(t) |
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