fact: Definition invariant I A (M:family I A) (F:A->A) (Q:I->A->Prop) := forall i x, (forall j, family_r M j i -> Q j x) -> Q i (F x).
imports: TLC(LibTactics LibLogic LibReflect LibEpsilon LibInt LibProd LibSum LibOperation LibRelation LibWf LibOrder LibMin)