Next Obligation.
rewrite !semFmapSize !semReturnSize. apply imset_eq. reflexivity.
Qed.

(* Specifications: *)
Lemma semCheckableQPropSize (qp : QProp) size :
semCheckableSize qp size <-> successful qp.
Lemma semCheckableQProp (qp : QProp) :
semCheckable qp  <-> successful qp.