* http://cs.unibo.it/helm/.
*)
-val simpl_tac: ProofEngineTypes.tactic
-val reduce_tac: ProofEngineTypes.tactic
-val whd_tac: ProofEngineTypes.tactic
+(* The default of term is the thesis of the goal to be prooved *)
+val simpl_tac:
+ also_in_hypotheses:bool -> term:(Cic.term option) -> ProofEngineTypes.tactic
+val reduce_tac:
+ also_in_hypotheses:bool -> term:(Cic.term option) -> ProofEngineTypes.tactic
+val whd_tac:
+ also_in_hypotheses:bool -> term:(Cic.term option) -> ProofEngineTypes.tactic
+
+val fold_tac:
+ also_in_hypotheses:bool -> term:Cic.term -> ProofEngineTypes.tactic