(** The [consider] tactic recovers some of the ease of reasoning about ** decision procedures when they are implemented as functions into bool. ** ** Implementation by Thomas Braibant (thomas.braibant@gmail.com) **)
(*Require Setoid. *)
(** This file defines some inductives, type-classes and tactics to perform reflection on a small scale *)
(** Two inductives to perform case-based reasonning *)
Inductive reflect (P Q : Prop) : bool -> Type :=
| reflect_true : P -> reflect P Q true
| reflect_false : Q -> reflect P Q false.
Inductive semi_reflect (P : Prop) : bool -> Type :=
| semi_reflect_true : P -> semi_reflect P true
| semi_reflect_false : semi_reflect P false.

Lemma reflect_false_inv P Q : reflect P Q false -> Q.