proposition: Lemma mapsto_derives_aux: forall x, EX d : bool, mapsto x (if d then 1 else 0) |-- exp (mapsto x).
proof: Proof. intros. apply exp_left; intro d. apply (exp_right (if d then 1 else 0)); auto. Qed.
imports: CertiGraph.msl_application.Graph VST.msl.seplog VST.msl.log_normalize VST.msl.alg_seplog_direct CertiGraph.msl_ext.abs_addr CertiGraph.msl_ext.seplog CertiGraph.msl_ext.log_normalize CertiGraph.msl_ext.precise_direct CertiGraph.msl_ext.overlapping_direct CertiGraph.msl_ext.alg_seplog_direct CertiGraph.msl_ext.ramify_tactics CertiGraph.heap_model_direct.SeparationAlgebra CertiGraph.heap_model_direct.mapsto CertiGraph.heap_model_direct.SeparationLogic VST.msl.msl_direct VST.msl.predicates_sa Coq.Numbers.Natural.Peano.NPeano Coq.ZArith.Znumtheory