is mentioned by

Thm* For any graph the_obj:GraphObject(the_graph), x,y:V. Dec(x = y)

[decidable__equal_gr_v]

In prior sections: core int 1 bool 1 int 2 rel 1 mb basic mb nat mb list 1 num thy 1 mb list 2 graph 1 1 graph 1 2

Try larger context: Graphs