+++ /dev/null
-(**************************************************************************)
-(* ___ *)
-(* ||M|| *)
-(* ||A|| A project by Andrea Asperti *)
-(* ||T|| *)
-(* ||I|| Developers: *)
-(* ||T|| The HELM team. *)
-(* ||A|| http://helm.cs.unibo.it *)
-(* \ / *)
-(* \ / This file is distributed under the terms of the *)
-(* v GNU General Public License Version 2 *)
-(* *)
-(**************************************************************************)
-
-include "ground_2/xoa/ex_1_2.ma".
-include "ground_2/notation/functions/tuple_4.ma".
-include "ground_2/notation/functions/zerozero_0.ma".
-include "ground_2/notation/functions/zeroone_0.ma".
-include "ground_2/notation/functions/onezero_0.ma".
-include "ground_2/lib/arith.ma".
-
-(* RT-TRANSITION COUNTER ****************************************************)
-
-record rtc: Type[0] ≝ {
- ri: nat; (* Note: inner r-steps *)
- rs: nat; (* Note: spine r-steps *)
- ti: nat; (* Note: inner t-steps *)
- ts: nat (* Note: spine t-steps *)
-}.
-
-interpretation "constructor (rtc)"
- 'Tuple ri rs ti ts = (mk_rtc ri rs ti ts).
-
-interpretation "one structural step (rtc)"
- 'ZeroZero = (mk_rtc O O O O).
-
-interpretation "one r-step (rtc)"
- 'OneZero = (mk_rtc O (S O) O O).
-
-interpretation "one t-step (rtc)"
- 'ZeroOne = (mk_rtc O O O (S O)).
-
-definition eq_f: relation rtc ≝ λc1,c2. ⊤.
-
-inductive eq_t: relation rtc ≝
-| eq_t_intro: ∀ri1,ri2,rs1,rs2,ti,ts.
- eq_t (〈ri1,rs1,ti,ts〉) (〈ri2,rs2,ti,ts〉)
-.
-
-(* Basic properties *********************************************************)
-
-lemma eq_t_refl: reflexive … eq_t.
-* // qed.
-
-(* Basic inversion lemmas ***************************************************)
-
-fact eq_t_inv_dx_aux: ∀x,y. eq_t x y →
- ∀ri1,rs1,ti,ts. x = 〈ri1,rs1,ti,ts〉 →
- ∃∃ri2,rs2. y = 〈ri2,rs2,ti,ts〉.
-#x #y * -x -y
-#ri1 #ri #rs1 #rs #ti1 #ts1 #ri2 #rs2 #ti2 #ts2 #H destruct -ri2 -rs2
-/2 width=3 by ex1_2_intro/
-qed-.
-
-lemma eq_t_inv_dx: ∀ri1,rs1,ti,ts,y. eq_t (〈ri1,rs1,ti,ts〉) y →
- ∃∃ri2,rs2. y = 〈ri2,rs2,ti,ts〉.
-/2 width=5 by eq_t_inv_dx_aux/ qed-.