Local Open Scope logic_base.
Local Open Scope syntax.
Local Open Scope kripke_model.

Lemma start_by_Aacq_or_Arel {Ac: Action} {Res: Resource} {Acr: Action_resource Ac Res} {nAcr: NormalAction_resource Ac Res}: forall r tr, start_by_Aacq r tr -> start_by_Arel r tr -> False.