t:Graph. Incidence(t) 
Edges(t)
Vertices(t)
Vertices(t)A:Type, B:(AType), p:(a:AB(a)). 2of(p) B(1of(p))A:Type, B:(AType), p:(a:AB(a)). 1of(p) A| Who Cites gr f? | |
| gr_f | Def Incidence(t) == 1of(2of(2of(t))) |
| Thm* t:Graph. Incidence(t) Edges(t)Vertices(t)Vertices(t) | |
| pi2 | Def 2of(t) == t.2 |
| Thm* A:Type, B:(AType), p:(a:AB(a)). 2of(p) B(1of(p)) | |
| pi1 | Def 1of(t) == t.1 |
| Thm* A:Type, B:(AType), p:(a:AB(a)). 1of(p) A |
| Syntax: | Incidence(t) | has structure: | gr_f(t) |
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