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With_N.v
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(*****************************************************************************)
(* Proof that Coq R is a fourcolor.model of real numbers. *)
(*****************************************************************************)
Require Import HOLLight_Real_With_N.logic HOLLight_Real_With_N.mappings Rbase Rdefinitions Rbasic_fun.
Open Scope R_scope.
Definition R' := {| type := R; el := 0%R |}.
Canonical R'.
Require Import Coq.Logic.ClassicalEpsilon.
Definition Rsup : (R -> Prop) -> R.
Proof.
intro E. case (excluded_middle_informative (bound E)); intro h.
case (excluded_middle_informative (exists x, E x)); intro i.
destruct (completeness E h i) as [b j]. exact b.
exact 0. exact 0.
Defined.
Lemma is_lub_Rsup E : bound E -> (exists x, E x) -> is_lub E (Rsup E).
Proof.
intros h i. unfold Rsup. case (excluded_middle_informative (bound E)); intro h'.
case (excluded_middle_informative (exists x, E x)); intro i'.
destruct (completeness E h' i') as [b j]. exact j. contradiction. contradiction.
Qed.
Require Import fourcolor.reals.real.
Import Real.
Require Import Coq.Init.Datatypes.
Definition R_struct : structure := {|
val := R;
le := Rle;
sup := Rsup;
add := Rplus;
zero := R0;
opp := Ropp;
mul := Rmult;
one := R1;
inv := Rinv
|}.
Canonical R_struct.
Lemma Rsup_upper_bound E : has_sup E -> ub E (Rsup E).
Proof.
intros [i j]. unfold Rsup. case (excluded_middle_informative (bound E)); intro c.
case (excluded_middle_informative (exists x : R, E x)); intro d.
destruct (completeness E c d) as [b [k l]]. intros x h. apply k. exact h.
intros x h. assert (exists x : R, E x). exists x. exact h. contradiction.
intros x h. assert (exists x : R, E x). exists x. exact h. contradiction.
Qed.
Lemma Rsup_total E x : has_sup E -> down E x \/ Rle (sup E) x.
Proof.
intros [i [b j]]. case (classic (down E x)); intro k. auto. right.
assert (l : bound E). exists b. exact j.
generalize (is_lub_Rsup E l i); intros [m n]. apply n.
intros y hy.
unfold down in k. rewrite ex2_eq, not_exists_eq in k.
generalize (k y); intro k'. rewrite not_conj_eq, <- imp_eq_disj in k'.
unfold Rle. left. apply Rnot_le_lt. apply k'. exact hy.
Qed.
(* Remark: in fourcolor, le is primitive and eq is defined as the
intersection of le and the inverse of le, but in coq, lt is primitive
and le is defined from lt and Logic.eq. *)
Lemma eq_R_struct : @eq R_struct = @Logic.eq R.
Proof.
apply fun_ext; intro x. apply fun_ext; intro y.
apply prop_ext; intro h. destruct h as [h i]. apply Rle_antisym; auto.
subst y. split; apply Rle_refl.
Qed.
Lemma R_axioms : axioms R_struct.
Proof.
apply Axioms.
apply Rle_refl.
apply Rle_trans.
apply Rsup_upper_bound.
apply Rsup_total.
apply Rplus_le_compat_l.
intros x y. rewrite eq_R_struct. apply Rplus_comm.
intros x y z. rewrite eq_R_struct. rewrite Rplus_assoc. reflexivity.
intro x. rewrite eq_R_struct. apply Rplus_0_l.
intro x. rewrite eq_R_struct. apply Rplus_opp_r.
apply Rmult_le_compat_l.
intros x y. rewrite eq_R_struct. apply Rmult_comm.
intros x y z. rewrite eq_R_struct. rewrite Rmult_assoc. reflexivity.
intros x y z. rewrite eq_R_struct. apply Rmult_plus_distr_l.
intro x. rewrite eq_R_struct. apply Rmult_1_l.
intro x. rewrite eq_R_struct. apply Rinv_r.
rewrite eq_R_struct. apply R1_neq_R0.
Qed.
Definition R_model : model := {|
model_structure := R_struct;
model_axioms := R_axioms;
|}.
Lemma eq_R_model :
@eq (model_structure R_model) = @Logic.eq (val (model_structure R_model)).
Proof. exact eq_R_struct. Qed.
Close Scope R_scope.
(*****************************************************************************)
(* Proof that real is a fourcolor.model of real numbers. *)
(*****************************************************************************)
Require Import HOLLight_Real_With_N.terms.
Lemma real_add_of_num p q :
real_of_num (p + q) = real_add (real_of_num p) (real_of_num q).
Proof.
unfold real_of_num, real_add.
f_equal. rewrite treal_add_of_num. apply fun_ext; intro x.
apply prop_ext; intro h.
exists (treal_of_num p). exists (treal_of_num q). split. exact h. split.
rewrite axiom_24_aux. reflexivity. exists (treal_of_num p). reflexivity.
rewrite axiom_24_aux. reflexivity. exists (treal_of_num q). reflexivity.
destruct h as [p' [q' [h1 [h2 h3]]]].
rewrite axiom_24_aux in h2. 2: exists (treal_of_num p); reflexivity.
rewrite axiom_24_aux in h3. 2: exists (treal_of_num q); reflexivity.
rewrite h2, h3. exact h1.
Qed.
Definition real_sup : (real -> Prop) -> real.
Proof.
intro P. case (excluded_middle_informative (exists x, P x)); intro h.
case (excluded_middle_informative (exists M, forall x, (P x) -> real_le x M)); intro i.
set (Q := fun M => (forall x : real, P x -> real_le x M) /\
(forall M' : real, (forall x : real, P x -> real_le x M')
-> real_le M M')).
exact (ε Q). exact (real_of_num 0). exact (real_of_num 0).
Defined.
Definition real_struct : structure := {|
val := real;
le := real_le;
sup := real_sup;
add := real_add;
zero := real_of_num 0;
opp := real_neg;
mul := real_mul;
one := real_of_num 1;
inv := real_inv
|}.
Canonical real_struct.
Require Import HOLLight_Real_With_N.theorems.
Lemma real_sup_is_lub E :
has_sup E -> ub E (real_sup E) /\ (forall b, ub E b -> real_le (real_sup E) b).
Proof.
intros [i j]. unfold real_sup.
destruct (excluded_middle_informative (exists x : real, E x)).
destruct (excluded_middle_informative (exists M : real, forall x : real, E x -> real_le x M)).
set (Q := fun M : real =>
(forall x : real, E x -> real_le x M) /\
(forall M' : real, (forall x : real, E x -> real_le x M') -> real_le M M')).
assert (k: exists M : real, Q M). apply (thm_REAL_COMPLETE E (conj i j)).
generalize (ε_spec k); intros [l m]. auto. contradiction. contradiction.
Qed.
Lemma real_sup_upper_bound E : has_sup E -> ub E (real_sup E).
Proof. intro h. apply (proj1 (real_sup_is_lub E h)). Qed.
Lemma real_sup_total E x : has_sup E -> down E x \/ real_le (real_sup E) x.
Proof.
intro h. case (classic (down E x)); intro k. auto. right.
generalize (real_sup_is_lub E h); intros [i j]. apply j.
intros y hy.
unfold down in k. rewrite ex2_eq, not_exists_eq in k.
generalize (k y); intro k'. rewrite not_conj_eq, <- imp_eq_disj in k'.
apply thm_REAL_LT_IMP_LE. apply k'. apply hy.
Qed.
Lemma eq_real_struct: @eq real_struct = @Logic.eq real.
Proof.
apply fun_ext; intro x. apply fun_ext; intro y.
unfold eq. rewrite thm_REAL_LE_ANTISYM. reflexivity.
Qed.
Require Import Lia.
Lemma real_axioms : axioms real_struct.
Proof.
apply Axioms.
apply thm_REAL_LE_REFL.
intros x y z xy yz; apply (thm_REAL_LE_TRANS x y z (conj xy yz)).
apply real_sup_upper_bound.
apply real_sup_total.
intros x y z yz; rewrite thm_REAL_LE_LADD; exact yz.
intros x y. rewrite eq_real_struct. apply thm_REAL_ADD_SYM.
intros x y z. rewrite eq_real_struct. apply thm_REAL_ADD_ASSOC.
intro x. rewrite eq_real_struct. apply thm_REAL_ADD_LID.
intro x. rewrite eq_real_struct. rewrite thm_REAL_ADD_SYM. apply thm_REAL_ADD_LINV.
intros x y z hx yz. apply thm_REAL_LE_LMUL. auto.
intros x y. rewrite eq_real_struct. apply thm_REAL_MUL_SYM.
intros x y z. rewrite eq_real_struct. apply thm_REAL_MUL_ASSOC.
intros x y z. rewrite eq_real_struct. apply thm_REAL_ADD_LDISTRIB.
intro x. rewrite eq_real_struct. apply thm_REAL_MUL_LID.
intro x. rewrite eq_real_struct. rewrite thm_REAL_MUL_SYM. apply thm_REAL_MUL_LINV.
unfold one, zero. simpl. rewrite eq_real_struct, thm_REAL_OF_NUM_EQ. lia.
Qed.
Definition real_model : model := {|
model_structure := real_struct;
model_axioms := real_axioms;
|}.
Lemma eq_real_model:
@eq (model_structure real_model) = @Logic.eq (val (model_structure real_model)).
Proof. exact eq_real_struct. Qed.
Require Import fourcolor.reals.realcategorical.
Definition R_of_real := @Rmorph_to real_model R_model.
Definition real_of_R := @Rmorph_to R_model real_model.
Lemma R_of_real_of_R r : R_of_real (real_of_R r) = r.
Proof. rewrite <- eq_R_model. apply (@Rmorph_to_inv R_model real_model). Qed.
Lemma real_of_R_of_real r : real_of_R (R_of_real r) = r.
Proof. rewrite <- eq_real_model. apply (@Rmorph_to_inv real_model R_model). Qed.
(*****************************************************************************)
(* Mapping of HOL-Light reals to Coq reals. *)
(*****************************************************************************)
Definition mk_real : ((prod hreal hreal) -> Prop) -> R := fun x => R_of_real (mk_real x).
Definition dest_real : R -> (prod hreal hreal) -> Prop := fun x => dest_real (real_of_R x).
Lemma axiom_23 : forall (a : R), (mk_real (dest_real a)) = a.
Proof. intro a. unfold mk_real, dest_real. rewrite axiom_23. apply R_of_real_of_R. Qed.
Lemma axiom_24_aux : forall r, (exists x, r = treal_eq x) -> dest_real (mk_real r) = r.
Proof.
intros c [x h]. unfold dest_real, mk_real.
rewrite real_of_R_of_real, <- axiom_24.
exists x. exact h.
Qed.
Lemma axiom_24 : forall (r : (prod hreal hreal) -> Prop), ((fun s : (prod hreal hreal) -> Prop => exists x : prod hreal hreal, s = (treal_eq x)) r) = ((dest_real (mk_real r)) = r).
Proof.
intro c. unfold dest_real, mk_real. rewrite real_of_R_of_real, <- axiom_24.
reflexivity.
Qed.
Lemma real_of_R_morph : morphism real_of_R.
Proof. apply Rmorph_toP. Qed.
Lemma le_morph_R x y : le x y = le (real_of_R x) (real_of_R y).
Proof.
generalize (morph_le real_of_R_morph x y); intros [h i]. apply prop_ext; auto.
Qed.
Lemma real_le_def : Rle = (fun x1 : R => fun y1 : R => @ε Prop (fun u : Prop => exists x1' : prod hreal hreal, exists y1' : prod hreal hreal, ((treal_le x1' y1') = u) /\ ((dest_real x1 x1') /\ (dest_real y1 y1')))).
Proof.
apply fun_ext; intro x. apply fun_ext; intro y.
unfold dest_real. rewrite le_morph_R.
generalize (real_of_R x); clear x; intro x.
generalize (real_of_R y); clear y; intro y.
reflexivity.
Qed.
Lemma add_morph_R x y : real_of_R (add x y) = (add (real_of_R x) (real_of_R y)).
Proof. rewrite <- eq_real_model. apply (morph_add real_of_R_morph). Qed.
Lemma add_eq x y : add x y = R_of_real (add (real_of_R x) (real_of_R y)).
Proof. rewrite <- add_morph_R, R_of_real_of_R. reflexivity. Qed.
Lemma real_add_def : Rplus = (fun x1 : R => fun y1 : R => mk_real (fun u : prod hreal hreal => exists x1' : prod hreal hreal, exists y1' : prod hreal hreal, (treal_eq (treal_add x1' y1') u) /\ ((dest_real x1 x1') /\ (dest_real y1 y1')))).
Proof.
apply fun_ext; intro x. apply fun_ext; intro y.
rewrite add_eq. unfold mk_real. apply f_equal. reflexivity.
Qed.
Lemma mul_morph_R x y : real_of_R (mul x y) = (mul (real_of_R x) (real_of_R y)).
Proof. rewrite <- eq_real_model. apply (morph_mul real_of_R_morph). Qed.
Lemma mul_eq x y : mul x y = R_of_real (mul (real_of_R x) (real_of_R y)).
Proof. rewrite <- mul_morph_R, R_of_real_of_R. reflexivity. Qed.
Lemma real_mul_def : Rmult = (fun x1 : R => fun y1 : R => mk_real (fun u : prod hreal hreal => exists x1' : prod hreal hreal, exists y1' : prod hreal hreal, (treal_eq (treal_mul x1' y1') u) /\ ((dest_real x1 x1') /\ (dest_real y1 y1')))).
Proof.
apply fun_ext; intro x. apply fun_ext; intro y.
rewrite mul_eq. unfold mk_real. apply f_equal. reflexivity.
Qed.
Lemma zero_morph_R : real_of_R 0%R = real_of_num 0.
Proof. rewrite <- eq_real_model. apply (morph_zero real_of_R_morph). Qed.
Lemma zero_eq : 0%R = R_of_real (real_of_num 0).
Proof. rewrite <- zero_morph_R, R_of_real_of_R. reflexivity. Qed.
Lemma inv_morph_R x : real_of_R (inv x) = inv (real_of_R x).
Proof.
case (classic (x = 0%R)); intro h.
subst x. unfold inv. simpl. rewrite Rinv_0, zero_eq, !real_of_R_of_real.
Set Printing All.
change (@Logic.eq (type real) (real_of_num 0) (real_inv (real_of_num 0))).
symmetry. apply thm_REAL_INV_0.
rewrite <- eq_real_model. apply (morph_inv real_of_R_morph).
rewrite eq_R_model. exact h.
Unset Printing All.
Qed.
Lemma inv_eq x : inv x = R_of_real (inv (real_of_R x)).
Proof. rewrite <- inv_morph_R, R_of_real_of_R. reflexivity. Qed.
Lemma real_inv_def : Rinv = (fun x : R => mk_real (fun u : prod hreal hreal => exists x' : prod hreal hreal, (treal_eq (treal_inv x') u) /\ (dest_real x x'))).
Proof. apply fun_ext; intro x. rewrite inv_eq. unfold mk_real. reflexivity. Qed.
Lemma neg_morph_R x : real_of_R (opp x) = opp (real_of_R x).
Proof. rewrite <- eq_real_model. apply (morph_opp real_of_R_morph). Qed.
Lemma neg_eq x : opp x = R_of_real (opp (real_of_R x)).
Proof. rewrite <- neg_morph_R, R_of_real_of_R. reflexivity. Qed.
Lemma real_neg_def : Ropp = (fun x1 : R => mk_real (fun u : prod hreal hreal => exists x1' : prod hreal hreal, (treal_eq (treal_neg x1') u) /\ (dest_real x1 x1'))).
Proof. apply fun_ext; intro x. rewrite neg_eq. unfold mk_real. reflexivity. Qed.
Lemma one_morph_R : real_of_R 1%R = real_of_num 1.
Proof. rewrite <- eq_real_model. apply (morph_one real_of_R_morph). Qed.
Lemma one_eq : 1%R = R_of_real (real_of_num 1).
Proof. rewrite <- one_morph_R, R_of_real_of_R. reflexivity. Qed.
(*Lemma INR_eq n : INR (S n) = (INR n + 1)%R.
Proof.
induction n; simpl.
rewrite Rplus_0_l. reflexivity.
destruct n as [|n]. reflexivity. reflexivity.
Qed.
Require Import Lia.
Lemma real_of_num_def : INR = (fun m : nat => mk_real (fun u : prod hreal hreal => treal_eq (treal_of_num m) u)).
Proof.
change (INR = fun m : nat => R_of_real (real_of_num m)).
apply fun_ext. induction x.
apply zero_eq.
rewrite INR_eq, IHx. rewrite add_eq, real_of_R_of_real, one_morph_R.
rewrite <- real_add_of_num. f_equal. f_equal. lia.
Qed.*)
(*Definition R_of_N n :=
match n with
| N0 => 0%R
| N.pos p => IPR p
end.
Lemma real_of_num_def : R_of_N = (fun m : N => mk_real (fun u : prod hreal hreal => treal_eq (treal_of_num m) u)).
Proof.
apply fun_ext; intro n. destruct n.
apply zero_eq.
induction p.
Qed.*)
Definition R_of_N n := R_of_real (real_of_num n). (*FIXME*)
Lemma real_of_num_def : R_of_N = (fun m : N => mk_real (fun u : prod hreal hreal => treal_eq (treal_of_num m) u)).
Proof. reflexivity. Qed.
Lemma R_of_N0 : R_of_N 0 = 0%R.
Proof. symmetry. apply zero_eq. Qed.
Lemma R_of_N1 : R_of_N 1 = 1%R.
Proof. symmetry. apply one_eq. Qed.
Lemma R_of_N_add p q : R_of_N (p + q) = (R_of_N p + R_of_N q)%R.
Proof.
unfold R_of_N. rewrite add_eq. rewrite !real_of_R_of_real. f_equal.
apply real_add_of_num.
Qed.
Lemma R_of_N_succ n : R_of_N (N.succ n) = (R_of_N n + 1)%R.
Proof. rewrite succ_eq_add_1, <- R_of_N1. apply R_of_N_add. Qed.
(*Fixpoint Rpower_nat r n : R :=
match n with
| 0 => 1
| S n => r * Rpower_nat r n
end.
Lemma real_pow_def : Rpower_nat = (@ε ((prod nat (prod nat (prod nat (prod nat (prod nat (prod nat (prod nat nat))))))) -> R -> nat -> R) (fun real_pow' : (prod nat (prod nat (prod nat (prod nat (prod nat (prod nat (prod nat nat))))))) -> R -> nat -> R => forall _24085 : prod nat (prod nat (prod nat (prod nat (prod nat (prod nat (prod nat nat)))))), (forall x : R, (real_pow' _24085 x (NUMERAL 0)) = (R_of_N (NUMERAL (BIT1 0)))) /\ (forall x : R, forall n : nat, (real_pow' _24085 x (S n)) = (Rmult x (real_pow' _24085 x n)))) (@pair nat (prod nat (prod nat (prod nat (prod nat (prod nat (prod nat nat)))))) (NUMERAL (BIT0 (BIT1 (BIT0 (BIT0 (BIT1 (BIT1 (BIT1 0)))))))) (@pair nat (prod nat (prod nat (prod nat (prod nat (prod nat nat))))) (NUMERAL (BIT1 (BIT0 (BIT1 (BIT0 (BIT0 (BIT1 (BIT1 0)))))))) (@pair nat (prod nat (prod nat (prod nat (prod nat nat)))) (NUMERAL (BIT1 (BIT0 (BIT0 (BIT0 (BIT0 (BIT1 (BIT1 0)))))))) (@pair nat (prod nat (prod nat (prod nat nat))) (NUMERAL (BIT0 (BIT0 (BIT1 (BIT1 (BIT0 (BIT1 (BIT1 0)))))))) (@pair nat (prod nat (prod nat nat)) (NUMERAL (BIT1 (BIT1 (BIT1 (BIT1 (BIT1 (BIT0 (BIT1 0)))))))) (@pair nat (prod nat nat) (NUMERAL (BIT0 (BIT0 (BIT0 (BIT0 (BIT1 (BIT1 (BIT1 0)))))))) (@pair nat nat (NUMERAL (BIT1 (BIT1 (BIT1 (BIT1 (BIT0 (BIT1 (BIT1 0)))))))) (NUMERAL (BIT1 (BIT1 (BIT1 (BIT0 (BIT1 (BIT1 (BIT1 0)))))))))))))))).
Proof.
generalize (@pair nat (prod nat (prod nat (prod nat (prod nat (prod nat (prod nat nat)))))) (NUMERAL (BIT0 (BIT1 (BIT0 (BIT0 (BIT1 (BIT1 (BIT1 0)))))))) (@pair nat (prod nat (prod nat (prod nat (prod nat (prod nat nat))))) (NUMERAL (BIT1 (BIT0 (BIT1 (BIT0 (BIT0 (BIT1 (BIT1 0)))))))) (@pair nat (prod nat (prod nat (prod nat (prod nat nat)))) (NUMERAL (BIT1 (BIT0 (BIT0 (BIT0 (BIT0 (BIT1 (BIT1 0)))))))) (@pair nat (prod nat (prod nat (prod nat nat))) (NUMERAL (BIT0 (BIT0 (BIT1 (BIT1 (BIT0 (BIT1 (BIT1 0)))))))) (@pair nat (prod nat (prod nat nat)) (NUMERAL (BIT1 (BIT1 (BIT1 (BIT1 (BIT1 (BIT0 (BIT1 0)))))))) (@pair nat (prod nat nat) (NUMERAL (BIT0 (BIT0 (BIT0 (BIT0 (BIT1 (BIT1 (BIT1 0)))))))) (@pair nat nat (NUMERAL (BIT1 (BIT1 (BIT1 (BIT1 (BIT0 (BIT1 (BIT1 0)))))))) (NUMERAL (BIT1 (BIT1 (BIT1 (BIT0 (BIT1 (BIT1 (BIT1 0))))))))))))))); generalize (@prod nat (prod nat (prod nat (prod nat (prod nat (prod nat (prod nat nat))))))); intros A a.
match goal with [|- _ = ε ?x _] => set (Q := x) end.
assert (i : exists q, Q q). exists (fun _ => Rpower_nat). split; simpl; intro x; reflexivity.
generalize (ε_spec i a). intros [h0 hs].
apply fun_ext; intro x. apply fun_ext; intro y.
induction y; simpl. rewrite h0. reflexivity. rewrite hs, IHy. reflexivity.
Qed.*)
Require Import RIneq.
Open Scope R_scope.
Lemma Rnot_le x y : (~ x <= y) = (x > y).
Proof.
apply prop_ext; intro h.
apply Rnot_le_gt. exact h.
apply Rgt_not_le. exact h.
Qed.
Lemma real_abs_def :
Rabs = (fun y0 : R => @COND R (Rle (R_of_N (NUMERAL 0)) y0) y0 (Ropp y0)).
Proof.
apply fun_ext; intro r. unfold Rabs. destruct (Rcase_abs r).
assert (h: (R_of_N (NUMERAL 0) <= r) = False). rewrite is_False, Rnot_le.
unfold NUMERAL. rewrite R_of_N0. exact r0.
rewrite h, COND_False. reflexivity.
assert (h: (R_of_N (NUMERAL 0) <= r) = True). rewrite is_True. apply Rge_le.
unfold NUMERAL. rewrite R_of_N0. exact r0.
rewrite h, COND_True. reflexivity.
Qed.
Lemma real_div_def : Rdiv = (fun y0 : R => fun y1 : R => Rmult y0 (Rinv y1)).
Proof.
apply fun_ext; intro x; apply fun_ext; intro y. reflexivity.
Qed.
Lemma real_sub_def : Rminus = (fun y0 : R => fun y1 : R => Rplus y0 (Ropp y1)).
Proof.
apply fun_ext; intro x; apply fun_ext; intro y. reflexivity.
Qed.
Lemma real_ge_def : Rge = (fun y0 : R => fun y1 : R => Rle y1 y0).
Proof.
apply fun_ext; intro x; apply fun_ext; intro y. apply prop_ext; intro h.
apply Rge_le. exact h. apply Rle_ge. exact h.
Qed.
Lemma real_gt_def : Rgt = (fun y0 : R => fun y1 : R => Rlt y1 y0).
Proof.
apply fun_ext; intro x; apply fun_ext; intro y. apply prop_ext; intro h.
apply Rgt_lt. exact h. apply Rlt_gt. exact h.
Qed.
Lemma real_lt_def : Rlt = (fun y0 : R => fun y1 : R => ~ (Rle y1 y0)).
Proof.
apply fun_ext; intro x; apply fun_ext; intro y. apply prop_ext; intro h.
rewrite Rnot_le. exact h. rewrite Rnot_le in h. exact h.
Qed.
Lemma real_max_def : Rmax = (fun y0 : R => fun y1 : R => @COND R (Rle y0 y1) y1 y0).
Proof.
apply fun_ext; intro x; apply fun_ext; intro y. unfold Rmax.
destruct (Rle_dec x y).
rewrite <- (is_True (x <= y)) in r. rewrite r, COND_True. reflexivity.
rewrite <- (is_False (x <= y)) in n. rewrite n, COND_False. reflexivity.
Qed.
Lemma real_min_def : Rmin = (fun y0 : R => fun y1 : R => @COND R (Rle y0 y1) y0 y1).
Proof.
apply fun_ext; intro x; apply fun_ext; intro y. unfold Rmin.
destruct (Rle_dec x y).
rewrite <- (is_True (x <= y)) in r. rewrite r, COND_True. reflexivity.
rewrite <- (is_False (x <= y)) in n. rewrite n, COND_False. reflexivity.
Qed.
(*****************************************************************************)
(* Mapping of integers. *)
(*****************************************************************************)
Definition Z' := {| type := Z; el := 0%Z |}.
Canonical Z'.
Definition int_of_real r := Z.pred (up r).
Lemma axiom_25 : forall (a : Z), (int_of_real (IZR a)) = a.
Proof.
intro k. unfold int_of_real. generalize (archimed (IZR k)).
generalize (up (IZR k)); intros l [h1 h2].
apply lt_IZR in h1. rewrite <- minus_IZR in h2. apply le_IZR in h2. lia.
Qed.
Definition integer : R -> Prop := fun _28588 : R => exists n : N, (Rabs _28588) = (R_of_N n).
Lemma minus_eq_minus x y : -x = y -> x = - y.
Proof. intro e. subst y. symmetry. apply Ropp_involutive. Qed.
Lemma integer_IZR r : integer r -> exists k, r = IZR k.
Proof.
intros [n h]. destruct (Rcase_abs r) as [i|i].
rewrite (Rabs_left _ i) in h. apply minus_eq_minus in h. subst r. clear i.
pattern n; revert n; apply N.peano_ind.
exists 0%Z. rewrite R_of_N0. ring.
intros n [k hk]. rewrite R_of_N_succ.
exists (k - 1)%Z. rewrite minus_IZR, <- hk. ring.
rewrite (Rabs_right _ i) in h. subst r. clear i.
pattern n; revert n; apply N.peano_ind.
exists 0%Z. rewrite R_of_N0. reflexivity.
intros n [k hk]. rewrite R_of_N_succ.
exists (k + 1)%Z. rewrite plus_IZR, <- hk. reflexivity.
Qed.
Definition Zabs (z:Z): N :=
match z with
| Z0 => N0
| Zpos p => N.pos p
| Zneg p => N.pos p
end.
Lemma pos_succ p : N.pos (Pos.succ p) = N.succ (N.pos p).
Proof. induction p; simpl; reflexivity. Qed.
Lemma IZR_pos_eq_R_of_N_pos p: IZR (Z.pos p) = R_of_N (N.pos p).
Proof.
pattern p; revert p; apply Pos.peano_ind.
rewrite R_of_N1. reflexivity.
intros p hp. rewrite Pos2Z.inj_succ, succ_IZR, pos_succ, R_of_N_succ, hp.
reflexivity.
Qed.
Lemma IZR_integer r : (exists k, r = IZR k) -> integer r.
Proof.
intros [k h]. subst r. exists (Zabs k). rewrite <- abs_IZR. destruct k; simpl.
rewrite <- R_of_N0. reflexivity. apply IZR_pos_eq_R_of_N_pos.
apply IZR_pos_eq_R_of_N_pos.
Qed.
Lemma axiom_26 : forall (r : R), ((fun x : R => integer x) r) = ((IZR (int_of_real r)) = r).
Proof.
intro r. apply prop_ext; intro h.
apply integer_IZR in h. destruct h as [k h]. subst r. apply f_equal.
apply axiom_25.
apply IZR_integer. exists (int_of_real r). symmetry. exact h.
Qed.
Close Scope R_scope.
(*****************************************************************************)
(* Sets. *)
(*****************************************************************************)
Definition IN {A : Type'} : A -> (A -> Prop) -> Prop := fun _32683 : A => fun _32684 : A -> Prop => _32684 _32683.
Definition EMPTY {A : Type'} : A -> Prop := fun x : A => False.
Definition INSERT {A : Type'} : A -> (A -> Prop) -> A -> Prop := fun _32739 : A => fun _32740 : A -> Prop => fun y : A => (@IN A y _32740) \/ (y = _32739).
Definition UNIV (A : Type') : A -> Prop := fun x : A => True.
Lemma UNIV_eq_INSERT A : UNIV A = INSERT (el A) (fun x => x <> el A).
Proof.
apply fun_ext; intro x. unfold INSERT. apply prop_ext; intro h.
2: exact Logic.I.
destruct (classic (x = el A)) as [i|i]. right. exact i. left. exact i.
Qed.
Lemma IN_el_not_el A: IN (el A) (fun x => x <> el A) = False.
Proof. rewrite is_False. intro h. apply h. reflexivity. Qed.
Definition Incl {A:Type'} (s s': A -> Prop) := forall x, IN x s -> IN x s'.
Lemma IN_set_eq_INSERT {A:Type'} (a:A) s:
IN a s -> s = INSERT a (fun x => IN x s /\ x <> a).
Proof.
intro h. apply fun_ext; intro x. apply prop_ext; unfold INSERT, IN; intro i.
destruct (classic (x = a)) as [j|j]; auto.
destruct i as [[i j]|i]. exact i. subst x. exact h.
Qed.
(*****************************************************************************)
(* Finite sets. *)
(*****************************************************************************)
Definition FINITE {A : Type'} : (A -> Prop) -> Prop := fun a : A -> Prop => forall FINITE' : (A -> Prop) -> Prop, (forall a' : A -> Prop, ((a' = (@EMPTY A)) \/ (exists x : A, exists s : A -> Prop, (a' = (@INSERT A x s)) /\ (FINITE' s))) -> FINITE' a') -> FINITE' a.
Inductive finite {A : Type'} : (A -> Prop) -> Prop :=
finite_EMPTY: finite EMPTY
| finite_INSERT a s : finite s -> finite (INSERT a s).
Lemma FINITE_eq_finite (A:Type') (s:A -> Prop) : FINITE s = finite s.
Proof.
apply prop_ext; intro h.
apply h. intros P [i|[x [s' [i j]]]]; rewrite i.
apply finite_EMPTY.
apply finite_INSERT. exact j.
induction h; intros P H; apply H.
left. reflexivity.
right. exists a. exists s. split. reflexivity. apply IHh. exact H.
Qed.
Require Import List.
Lemma finite_list_NoDup {A:Type'} (s:A -> Prop):
finite s = (exists l, NoDup l /\ s = fun x => In x l).
Proof.
apply prop_ext; intro H.
induction H.
exists nil. split.
apply NoDup_nil.
apply fun_ext; intro x. apply prop_ext; intro h; contradiction.
destruct IHfinite as [l [n e]]. subst s. destruct (classic (In a l)).
exists l. split. exact n. apply fun_ext; intro x. unfold INSERT.
apply prop_ext; intro h.
destruct h as [h|h]. exact h. subst x. exact H0. left. exact h.
exists (cons a l). split. apply NoDup_cons. exact H0. exact n.
apply fun_ext; intro x. unfold INSERT. apply prop_ext; simpl; intro h.
destruct h as [h|h]. right. exact h. left. symmetry; exact h.
destruct h as [h|h]. right. symmetry; exact h. left. exact h.
destruct H as [l e]. generalize e; clear e. generalize s; clear s.
induction l; intros s [n e].
subst s. apply finite_EMPTY.
set (s' := fun x => In x l). assert (j: s = INSERT a s').
apply fun_ext; intro x. rewrite e. unfold INSERT. simpl.
apply prop_ext; intro h; firstorder.
rewrite j. apply finite_INSERT. apply IHl. split.
inversion n. assumption. reflexivity.
Qed.
Definition elements {A:Type'} (s:A -> Prop) := ε (fun l => NoDup l /\ s = fun x => In x l).
Lemma elements_spec {A:Type'} {s:A -> Prop} (h:finite s):
NoDup (elements s) /\ s = fun x => In x (elements s).
Proof.
unfold elements.
match goal with [|- _ (ε ?x) /\ _] => set (Q := x) end.
assert (i: exists l, Q l). rewrite finite_list_NoDup in h.
destruct h as [l h]. exists l. exact h.
generalize (ε_spec i). firstorder.
Qed.
Lemma In_elements {A:Type'} {s: A -> Prop} : finite s -> forall x, In x (elements s) = IN x s.
Proof.
intro h. generalize (elements_spec h); intros [n e] x. rewrite e at 2.
reflexivity.
Qed.
Lemma elements_EMPTY (A:Type') : elements (@EMPTY A) = nil.
Proof.
generalize (elements_spec (@finite_EMPTY A)). intros [n e].
destruct (elements EMPTY). reflexivity.
apply False_rec. apply ext_fun with (x:=t) in e. unfold EMPTY in e.
rewrite e. simpl. left. reflexivity.
Qed.
Require Import Permutation.
Lemma eq_mod_permut A (l: list A):
forall l', (forall x, In x l = In x l') -> NoDup l -> NoDup l' -> Permutation l l'.
Proof.
induction l; destruct l'.
intros. apply perm_nil.
intro e. generalize (e a). simpl. intro h. symmetry in h.
apply False_rec. rewrite <- h. left. reflexivity.
intro e. generalize (e a). simpl. intro h.
apply False_rec. rewrite <- h. left. reflexivity.
intros e n n'. inversion n; inversion n'; subst.
destruct (classic (a = a0)).
(* case a = a0 *)
subst a0. apply perm_skip. apply IHl.
intro x. apply prop_ext; intro h.
assert (i: In x (a::l)). right. exact h.
rewrite e in i. destruct i. subst x. contradiction. exact H.
assert (i: In x (a::l')). right. exact h.
rewrite <- e in i. destruct i. subst x. contradiction. exact H.
assumption.
assumption.
(* case a <> a0 *)
assert (i: In a (a0 :: l')). rewrite <- (e a). left. reflexivity.
apply in_split in i. destruct i as [l1 [l2 i]]. rewrite i.
rewrite <- Permutation_middle. apply perm_skip. apply IHl.
2: assumption.
2: apply NoDup_remove_1 with a; rewrite <- i; apply NoDup_cons; assumption.
intro x. apply prop_ext; intro h.
assert (j: In x (a::l)). right. exact h.
rewrite e, i in j. apply in_elt_inv in j. destruct j as [j|j].
subst x. contradiction. exact j.
assert (j: In x (l1 ++ a :: l2)). apply in_or_app. apply in_app_or in h.
destruct h as [h|h]. left. exact h. right. right. exact h.
rewrite <- i, <- e in j. destruct j as [j|j].
subst x. rewrite i in n'. apply NoDup_remove in n'. destruct n' as [h1 h2].
contradiction. exact j.
Qed.
Lemma elements_INSERT {A:Type'} (a:A) {s} :
finite s -> exists l', Permutation l' (a :: elements s) /\
elements (INSERT a s) = COND (IN a s) (elements s) l'.
Proof.
intro h. assert (h': finite (INSERT a s)). apply finite_INSERT. exact h.
destruct (prop_degen (IN a s)) as [e|e]; rewrite e.
exists (a :: elements s). split. reflexivity.
rewrite COND_True. f_equal. apply fun_ext; intro x.
apply prop_ext; firstorder. subst x. rewrite is_True in e. exact e.
exists (elements (INSERT a s)). split. 2: rewrite COND_False; reflexivity.
apply eq_mod_permut. intro x. rewrite (In_elements h').
unfold IN, INSERT, IN. simpl.
apply prop_ext; intros [i|i]. right. rewrite (In_elements h). exact i.
subst x. left. reflexivity. subst x. right. reflexivity.
rewrite (In_elements h) in i. left. exact i.
generalize (elements_spec h'); intros [n i]. exact n.
apply NoDup_cons. rewrite (In_elements h), <- is_False. exact e.
generalize (elements_spec h); intros [n i]. exact n.
Qed.
Definition permut_inv {A B:Type} (f:A -> B -> A) :=
forall a y x, f (f a y) x = f (f a x) y.
Lemma eq_fold_left_permut {A B} {f:A -> B -> A}: permut_inv f ->
forall l l', Permutation l l' -> forall a, fold_left f l a = fold_left f l' a.
Proof.
intro H. induction 1; intro a; simpl.
reflexivity.
apply IHPermutation. rewrite H. reflexivity.
transitivity (fold_left f l' a). apply IHPermutation1. apply IHPermutation2.
Qed.
Lemma fold_left_eq_permut {A B} {f:A -> B -> A}: permut_inv f ->
forall l a b, fold_left f l (f a b) = f (fold_left f l a) b.
Proof.
intro H. induction l as [|x l]; intros a b; simpl.
reflexivity.
rewrite <- IHl. f_equal. apply H.
Qed.
Definition ITSET {A B : Type'} : (B -> A -> A) -> (B -> Prop) -> A -> A := fun f : B -> A -> A => fun s : B -> Prop => fun a : A => @ε ((B -> Prop) -> A) (fun g : (B -> Prop) -> A => ((g (@EMPTY B)) = a) /\ (forall x : B, forall s : B -> Prop, (@FINITE B s) -> (g (@INSERT B x s)) = (@COND A (@IN B x s) (g s) (f x (g s))))) s.
Definition itset {A B:Type'} : (B -> A -> A) -> (B -> Prop) -> A -> A := fun f : B -> A -> A => let F := fun a b => f b a in fun s : B -> Prop => fun a : A => fold_left F (elements s) a.
Lemma itset_EMPTY {A B:Type'} (f:B -> A -> A) a: itset f EMPTY a = a.
Proof.
unfold itset. rewrite elements_EMPTY. simpl. reflexivity.
Qed.
Definition permut_inv' {A B:Type} (f:B -> A -> A) :=
forall a y x, f x (f y a) = f y (f x a).
Lemma itset_INSERT {A B:Type'} (f:B -> A -> A) a b s: permut_inv' f -> finite s ->
itset f (INSERT b s) a = COND (IN b s) (itset f s a) (f b (itset f s a)).
Proof.
intros H h. unfold itset. set (F := fun a b => f b a).
assert (H': permut_inv F). exact H.
destruct (elements_INSERT b h) as [l [p e]]. rewrite e.
destruct (prop_degen (IN b s)) as [i|i]; rewrite i.
rewrite !COND_True. reflexivity.
rewrite !COND_False. transitivity (fold_left F (b :: elements s) a).
apply (eq_fold_left_permut H). exact p.
apply (fold_left_eq_permut H').
Qed.
Lemma exists_ITSET {A B:Type'} {f:B -> A -> A}: permut_inv' f ->
forall a, let g := fun s => itset f s a in
g EMPTY = a /\
(forall (x : B) (s : B -> Prop),
FINITE s -> g (INSERT x s) = COND (IN x s) (g s) (f x (g s))).
Proof.
intros H a g. unfold g. split. apply itset_EMPTY. intros b s h.
apply itset_INSERT. exact H. rewrite <- FINITE_eq_finite. exact h.
Qed.
Lemma ITSET_eq_itset (A B:Type') (f:B -> A -> A):
permut_inv' f -> forall s, finite s -> forall a, ITSET f s a = itset f s a.
Proof.
intros H s h a.
unfold ITSET. match goal with [|- ε ?x _ = _] => set (Q := x) end.
assert (i: exists g, Q g). exists (fun s => itset f s a). apply exists_ITSET. exact H.
generalize (ε_spec i). intros [j k]. generalize s h. induction 1.
rewrite itset_EMPTY. exact j.
rewrite k. unfold reverse_coercion in IHh0. rewrite IHh0, itset_INSERT.
reflexivity. exact H. exact h0. rewrite FINITE_eq_finite. exact h0.
Qed.
Definition CARD {_99571 : Type'} : (_99571 -> Prop) -> N := fun _44539 : _99571 -> Prop => @ITSET N _99571 (fun x : _99571 => fun n : N => N.succ n) _44539 (NUMERAL 0).
Definition dimindex {A : Type'} : (A -> Prop) -> N := fun _97595 : A -> Prop => @COND N (@FINITE A (UNIV A)) (@CARD A (UNIV A)) (NUMERAL (BIT1 0)).
Lemma Incl_finite {A:Type'} (s: A -> Prop) : finite s -> forall s', Incl s' s -> finite s'.
Proof.
induction 1.
intros s i. assert (e: s = EMPTY). apply fun_ext; intro x.
unfold EMPTY. rewrite is_False. intro h. apply (i x). exact h.
rewrite e. apply finite_EMPTY.
intros s' i. destruct (classic (Incl s' s)) as [h|h].
apply IHfinite. exact h.
assert (j: IN a s'). unfold Incl in h. rewrite not_forall_eq in h.
destruct h as [x h]. rewrite imp_eq_disj, not_disj_eq in h.
destruct h as [h1 h2]. apply NNPP in h1. generalize (i x h1).
intros [j|j]. contradiction. subst x. exact h1.
apply IN_set_eq_INSERT in j. rewrite j. apply finite_INSERT.
apply IHfinite. intros x [h1 h2]. generalize (i x h1). intros [k|k].
exact k. contradiction.
Qed.
Lemma dimindex_UNIV_gt_0 A : 0 < dimindex (UNIV A).
Proof.
assert (p1: permut_inv' (fun (_ : A) (n : N) => N.succ n)).
unfold permut_inv'. reflexivity.
unfold dimindex. case (prop_degen (FINITE (UNIV A))); intro h; rewrite h.
assert (p2: finite (UNIV A)). rewrite <- FINITE_eq_finite, h. exact Logic.I.
assert (p3: finite (fun x : A => x <> el A)). apply (Incl_finite (UNIV A)). exact p2.
intros x _. exact Logic.I.
rewrite COND_True. unfold CARD.
rewrite ITSET_eq_itset, UNIV_eq_INSERT, itset_INSERT, IN_el_not_el, COND_False; auto.
lia.
rewrite COND_False. unfold NUMERAL, BIT1. lia.
Qed.
(*****************************************************************************)
(* Cart.finite_image: natural numbers between 1 and the cardinal of A,
if A is finite, and 1 otherwise. *)
(*****************************************************************************)
Definition GSPEC {A : Type'} : (A -> Prop) -> A -> Prop := fun _32695 : A -> Prop => _32695.
Definition SETSPEC {_83031 : Type'} : _83031 -> Prop -> _83031 -> Prop := fun _32700 : _83031 => fun _32701 : Prop => fun _32702 : _83031 => _32701 /\ (_32700 = _32702).
Definition dotdot : N -> N -> N -> Prop := fun _69692 : N => fun _69693 : N => @GSPEC N (fun GEN_PVAR_229 : N => exists x : N, @SETSPEC N GEN_PVAR_229 ((N.le _69692 x) /\ (N.le x _69693)) x).
Definition finite_image_pred (A:Type') x :=
@IN N x (dotdot (NUMERAL (BIT1 0)) (@dimindex A (UNIV A))).
Lemma finite_image_pred1 (A:Type') : finite_image_pred A 1.
Proof.
unfold finite_image_pred, IN, dotdot, GSPEC, SETSPEC, NUMERAL, BIT1, BIT0.
exists 1. generalize (dimindex_UNIV_gt_0 A). lia.
Qed.
Definition finite_image : Type' -> Type' :=
fun A => subtype (finite_image_pred1 A).
Definition finite_index : forall {A : Type'}, N -> finite_image A :=
fun A => mk (finite_image_pred1 A).
Definition dest_finite_image : forall {A : Type'}, (finite_image A) -> N :=
fun A => dest (finite_image_pred1 A).
Lemma axiom_27 : forall {A : Type'} (a : finite_image A), (@finite_index A (@dest_finite_image A a)) = a.
Proof. intros A a. apply mk_dest. Qed.
Lemma axiom_28 : forall {A : Type'} (r : N), ((fun x : N => @IN N x (dotdot (NUMERAL (BIT1 0)) (@dimindex A (UNIV A)))) r) = ((@dest_finite_image A (@finite_index A r)) = r).
Proof. intros A r. apply dest_mk. Qed.
(*****************************************************************************)
(* Cart.cart A B is finite_image B -> A. *)
(*****************************************************************************)
Definition cart A B := finite_image B -> A.
Definition mk_cart : forall {A B : Type'}, ((finite_image B) -> A) -> cart A B :=
fun A B f => f.
Definition dest_cart : forall {A B : Type'}, (cart A B) -> (finite_image B) -> A :=
fun A B f => f.
Lemma axiom_29 : forall {A B : Type'} (a : cart A B), (@mk_cart A B (@dest_cart A B a)) = a.
Proof. reflexivity. Qed.
Lemma axiom_30 : forall {A B : Type'} (r : (finite_image B) -> A), ((fun f : (finite_image B) -> A => True) r) = ((@dest_cart A B (@mk_cart A B r)) = r).
Proof. intros A B r. apply prop_ext; intros _. reflexivity. exact Logic.I. Qed.
(*****************************************************************************)
(* Cart.finite_sum *)
(*****************************************************************************)
Definition finite_sum_pred (A B: Type') x := @IN N x (dotdot (NUMERAL (BIT1 0)) (N.add (@dimindex A (UNIV A)) (@dimindex B (UNIV B)))).
Lemma finite_sum_pred1 (A B:Type') : finite_sum_pred A B 1.
Proof.
unfold finite_sum_pred, IN, dotdot, GSPEC, SETSPEC, NUMERAL, BIT1, BIT0.
exists 1. generalize (dimindex_UNIV_gt_0 A) (dimindex_UNIV_gt_0 B). lia.
Qed.
Definition finite_sum : Type' -> Type' -> Type' :=
fun A B => subtype (finite_sum_pred1 A B).
Definition mk_finite_sum : forall {A B : Type'}, N -> finite_sum A B :=
fun A B => mk (finite_sum_pred1 A B).
Definition dest_finite_sum : forall {A B : Type'}, (finite_sum A B) -> N :=
fun A B => dest (finite_sum_pred1 A B).
Lemma axiom_31 : forall {A B : Type'} (a : finite_sum A B), (@mk_finite_sum A B (@dest_finite_sum A B a)) = a.
Proof. intros A a. apply mk_dest. Qed.
Lemma axiom_32 : forall {A B : Type'} (r : N), ((fun x : N => @IN N x (dotdot (NUMERAL (BIT1 0)) (N.add (@dimindex A (UNIV A)) (@dimindex B (UNIV B))))) r) = ((@dest_finite_sum A B (@mk_finite_sum A B r)) = r).
Proof. intros A r. apply dest_mk. Qed.
(*****************************************************************************)
(* Cart.finite_diff *)
(*****************************************************************************)
Definition finite_diff_pred (A B: Type') x := @IN N x (dotdot (NUMERAL (BIT1 0)) (@COND N (N.lt (@dimindex B (UNIV B)) (@dimindex A (UNIV A))) (N.sub (@dimindex A (UNIV A)) (@dimindex B (UNIV B))) (NUMERAL (BIT1 0)))).
Lemma finite_diff_pred1 (A B:Type') : finite_diff_pred A B 1.
Proof.
unfold finite_diff_pred, IN, dotdot, GSPEC, SETSPEC, NUMERAL, BIT1, BIT0.
exists 1. generalize (dimindex_UNIV_gt_0 A) (dimindex_UNIV_gt_0 B); intros.
case (prop_degen (dimindex (UNIV B) < dimindex (UNIV A))); intro h; rewrite h.
rewrite COND_True. rewrite is_True in h. lia.
rewrite COND_False. rewrite is_False in h. lia.
Qed.
Definition finite_diff : Type' -> Type' -> Type' :=
fun A B => subtype (finite_diff_pred1 A B).
Definition mk_finite_diff : forall {A B : Type'}, N -> finite_diff A B :=
fun A B => mk (finite_diff_pred1 A B).
Definition dest_finite_diff : forall {A B : Type'}, (finite_diff A B) -> N :=
fun A B => dest (finite_diff_pred1 A B).
Lemma axiom_33 : forall {A B : Type'} (a : finite_diff A B), (@mk_finite_diff A B (@dest_finite_diff A B a)) = a.
Proof. intros A a. apply mk_dest. Qed.
Lemma axiom_34 : forall {A B : Type'} (r : N), ((fun x : N => @IN N x (dotdot (NUMERAL (BIT1 0)) (@COND N (N.lt (@dimindex B (UNIV B)) (@dimindex A (UNIV A))) (N.sub (@dimindex A (UNIV A)) (@dimindex B (UNIV B))) (NUMERAL (BIT1 0))))) r) = ((@dest_finite_diff A B (@mk_finite_diff A B r)) = r).
Proof. intros A r. apply dest_mk. Qed.
(*****************************************************************************)
(* Cart.finite_prod *)
(*****************************************************************************)
Definition finite_prod_pred (A B: Type') x := @IN N x (dotdot (NUMERAL (BIT1 0)) (N.mul (@dimindex A (@UNIV A)) (@dimindex B (@UNIV B)))).
Lemma finite_prod_pred1 (A B:Type') : finite_prod_pred A B 1.
Proof.
unfold finite_prod_pred, IN, dotdot, GSPEC, SETSPEC, NUMERAL, BIT1, BIT0.
exists 1. generalize (dimindex_UNIV_gt_0 A) (dimindex_UNIV_gt_0 B); intros. lia.
Qed.
Definition finite_prod : Type' -> Type' -> Type' :=
fun A B => subtype (finite_prod_pred1 A B).
Definition mk_finite_prod : forall {A B : Type'}, N -> finite_prod A B :=
fun A B => mk (finite_prod_pred1 A B).
Definition dest_finite_prod : forall {A B : Type'}, (finite_prod A B) -> N :=
fun A B => dest (finite_prod_pred1 A B).
Lemma axiom_35 : forall {A B : Type'} (a : finite_prod A B), (@mk_finite_prod A B (@dest_finite_prod A B a)) = a.
Proof. intros A a. apply mk_dest. Qed.
Lemma axiom_36 : forall {A B : Type'} (r : N), ((fun x : N => @IN N x (dotdot (NUMERAL (BIT1 0)) (N.mul (@dimindex A (@UNIV A)) (@dimindex B (@UNIV B))))) r) = ((@dest_finite_prod A B (@mk_finite_prod A B r)) = r).
Proof. intros A r. apply dest_mk. Qed.
(*****************************************************************************)
(* Mapping of a subtype of recspace (non-recursive inductive type definition) *)
(*****************************************************************************)
Section non_recursive_inductive_type.
Variable A : Type'.
Definition nr_constr (a:A) : recspace A := CONSTR 0 a (fun n => BOTTOM).
Definition nr_pred (r : recspace A) := exists a, r = nr_constr a.
Lemma nr_pred1 : nr_pred (nr_constr (el A)).
Proof. exists (el A). reflexivity. Qed.
Definition nr_type := @subtype (recspace A) _ _ nr_pred1.
Definition nr_mk : recspace A -> nr_type := @mk (recspace A) _ _ nr_pred1.
Definition nr_dest : nr_type -> recspace A := @dest (recspace A) _ _ nr_pred1.
Lemma nr_mk_dest : forall a : nr_type, (nr_mk (nr_dest a)) = a.
Proof. intro a. apply mk_dest. Qed.
Lemma nr_dest_mk : forall r : recspace A, (forall P : recspace A -> Prop, (forall r' : recspace A, nr_pred r' -> P r') -> P r) = (nr_dest (nr_mk r) = r).