fact: Definition lift_rel_union (A:Type) (B:Type) (TA : A -> A -> Prop) (TB : B -> B -> Prop) (SA : A -> B -> Prop) (SB : B -> A -> Prop) (x : A + B) (y : A + B) : Prop.
imports: Coq(Arith Relations Lia) AlmostFull.PropBounded(AlmostFull) AlmostFull.PropBounded(AFConstructions)