Who Cites rel-graph?
rel-graph	Def Graph(x,y:T. R(x;y)) == < vertices = T, edges = {p:(TT)| R(1of(p);2of(p)) }, incidence = Id >
tidentity	Def Id == Id
	Thm* A:Type. Id AA
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
mkgraph	Def < vertices = v, edges = e, incidence = f > == < v,e,f,o >
	Thm* v,e:Type, f:(evv), o:Top. < vertices = v, edges = e, incidence = f > Graph
identity	Def Id(x) == x
	Thm* A:Type. Id AA

Syntax:

Graph(x,y:T. R(x;y))

has structure:

rel-graph(T; x,y.R(x;y))

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