is mentioned by

Def adjl-graph(G) == < vertices = G.size, edges = x:G.size||G.out(x)||, incidence = e. < 1of(e),(G.out(1of(e)))[2of(e)] > >	[adjl-graph]
Def adjm-graph(A) == < vertices = A.size, edges = {p:(A.sizeA.size)| (A.adj(1of(p),2of(p))) }, incidence = e.e >	[adjm-graph]

In prior sections: graph 1 2

Try larger context: Graphs