fact: Definition same_data (o m : E) (c : E2) (i: E1) (o1 m1 : E) (c1 : E2) (i1: E1):= (forall x, inc x o = inc x o1) & (forall u, inc u m = inc u m1) & (forall u v, inc u m -> inc v m -> source u = target v -> c u v = c1 u v) & (forall x, inc x o -> i x = i1 x).
imports: Arith universe