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Unverified Commit d4513f41 authored by Guillaume Melquiond's avatar Guillaume Melquiond Committed by GitHub
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Update Flocq to 3.4.0 (#383)

parent 548e62be
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Makefile
View file @ d4513f41
......@@ -57,6 +57,7 @@ GPATH=$(DIRS)
ifeq ($(LIBRARY_FLOCQ),local)
FLOCQ=\
SpecFloatCompat.v \
Raux.v Zaux.v Defs.v Digits.v Float_prop.v FIX.v FLT.v FLX.v FTZ.v \
Generic_fmt.v Round_pred.v Round_NE.v Ulp.v Core.v \
Bracket.v Div.v Operations.v Round.v Sqrt.v \
......
flocq/Calc/Bracket.v
View file @ d4513f41
......@@ -19,15 +19,19 @@ COPYING file for more details.
(** * Locations: where a real number is positioned with respect to its rounded-down value in an arbitrary format. *)
From Coq Require Import Lia.
Require Import Raux Defs Float_prop.
Require Import SpecFloatCompat.
Notation location := location (only parsing).
Notation loc_Exact := loc_Exact (only parsing).
Notation loc_Inexact := loc_Inexact (only parsing).
Section Fcalc_bracket.
Variable d u : R.
Hypothesis Hdu : (d < u)%R.
Inductive location := loc_Exact | loc_Inexact : comparison -> location.
Variable x : R.
Definition inbetween_loc :=
......@@ -233,7 +237,7 @@ apply Rplus_le_compat_l.
apply Rmult_le_compat_r.
now apply Rlt_le.
apply IZR_le.
omega.
lia.
(* . *)
now rewrite middle_range.
Qed.
......@@ -246,7 +250,7 @@ Theorem inbetween_step_Lo :
Proof.
intros x k l Hx Hk1 Hk2.
apply inbetween_step_not_Eq with (1 := Hx).
omega.
lia.
apply Rcompare_Lt.
assert (Hx' := inbetween_bounds _ _ (ordered_steps _) _ _ Hx).
apply Rlt_le_trans with (1 := proj2 Hx').
......@@ -255,7 +259,7 @@ rewrite Rcompare_plus_l, Rcompare_mult_r, Rcompare_half_l.
apply Rcompare_not_Lt.
rewrite <- mult_IZR.
apply IZR_le.
omega.
lia.
exact Hstep.
Qed.
......@@ -267,7 +271,7 @@ Theorem inbetween_step_Hi :
Proof.
intros x k l Hx Hk1 Hk2.
apply inbetween_step_not_Eq with (1 := Hx).
omega.
lia.
apply Rcompare_Gt.
assert (Hx' := inbetween_bounds _ _ (ordered_steps _) _ _ Hx).
apply Rlt_le_trans with (2 := proj1 Hx').
......@@ -276,7 +280,7 @@ rewrite Rcompare_plus_l, Rcompare_mult_r, Rcompare_half_l.
apply Rcompare_Lt.
rewrite <- mult_IZR.
apply IZR_lt.
omega.
lia.
exact Hstep.
Qed.
......@@ -331,7 +335,7 @@ Theorem inbetween_step_any_Mi_odd :
Proof.
intros x k l Hx Hk.
apply inbetween_step_not_Eq with (1 := Hx).
omega.
lia.
inversion_clear Hx as [|l' _ Hl].
now rewrite (middle_odd _ Hk) in Hl.
Qed.
......@@ -344,7 +348,7 @@ Theorem inbetween_step_Lo_Mi_Eq_odd :
Proof.
intros x k Hx Hk.
apply inbetween_step_not_Eq with (1 := Hx).
omega.
lia.
inversion_clear Hx as [Hl|].
rewrite Hl.
rewrite Rcompare_plus_l, Rcompare_mult_r, Rcompare_half_r.
......@@ -365,7 +369,7 @@ Theorem inbetween_step_Hi_Mi_even :
Proof.
intros x k l Hx Hl Hk.
apply inbetween_step_not_Eq with (1 := Hx).
omega.
lia.
apply Rcompare_Gt.
assert (Hx' := inbetween_bounds_not_Eq _ _ _ _ Hx Hl).
apply Rle_lt_trans with (2 := proj1 Hx').
......@@ -387,7 +391,7 @@ Theorem inbetween_step_Mi_Mi_even :
Proof.
intros x k Hx Hk.
apply inbetween_step_not_Eq with (1 := Hx).
omega.
lia.
apply Rcompare_Eq.
inversion_clear Hx as [Hx'|].
rewrite Hx', <- Hk, mult_IZR.
......@@ -433,10 +437,10 @@ now apply inbetween_step_Lo_not_Eq with (2 := H1).
destruct (Zcompare_spec (2 * k) nb_steps) as [Hk1|Hk1|Hk1].
(* . 2 * k < nb_steps *)
apply inbetween_step_Lo with (1 := Hx).
omega.
lia.
destruct (Zeven_ex nb_steps).
rewrite He in H.
omega.
lia.
(* . 2 * k = nb_steps *)
set (l' := match l with loc_Exact => Eq | _ => Gt end).
assert ((l = loc_Exact /\ l' = Eq) \/ (l <> loc_Exact /\ l' = Gt)).
......@@ -490,7 +494,7 @@ now apply inbetween_step_Lo_not_Eq with (2 := H1).
destruct (Zcompare_spec (2 * k + 1) nb_steps) as [Hk1|Hk1|Hk1].
(* . 2 * k + 1 < nb_steps *)
apply inbetween_step_Lo with (1 := Hx) (3 := Hk1).
omega.
lia.
(* . 2 * k + 1 = nb_steps *)
destruct l.
apply inbetween_step_Lo_Mi_Eq_odd with (1 := Hx) (2 := Hk1).
......@@ -499,7 +503,7 @@ apply inbetween_step_any_Mi_odd with (1 := Hx) (2 := Hk1).
apply inbetween_step_Hi with (1 := Hx).
destruct (Zeven_ex nb_steps).
rewrite Ho in H.
omega.
lia.
apply Hk.
Qed.
......@@ -612,7 +616,7 @@ clear -Hk. intros m.
rewrite (F2R_change_exp beta e).
apply (f_equal (fun r => F2R (Float beta (m * Zpower _ r) e))).
ring.
omega.
lia.
assert (Hp: (Zpower beta k > 0)%Z).
apply Z.lt_gt.
apply Zpower_gt_0.
......@@ -622,7 +626,7 @@ rewrite 2!Hr.
rewrite Zmult_plus_distr_l, Zmult_1_l.
unfold F2R at 2. simpl.
rewrite plus_IZR, Rmult_plus_distr_r.
apply new_location_correct.
apply new_location_correct; unfold F2R; simpl.
apply bpow_gt_0.
now apply Zpower_gt_1.
now apply Z_mod_lt.
......@@ -665,7 +669,7 @@ rewrite <- Hm in H'. clear -H H'.
apply inbetween_unique with (1 := H) (2 := H').
destruct (inbetween_float_bounds x m e l H) as (H1,H2).
destruct (inbetween_float_bounds x m' e l' H') as (H3,H4).
cut (m < m' + 1 /\ m' < m + 1)%Z. clear ; omega.
cut (m < m' + 1 /\ m' < m + 1)%Z. clear ; lia.
now split ; apply lt_F2R with beta e ; apply Rle_lt_trans with x.
Qed.
......
flocq/Calc/Div.v
View file @ d4513f41
......@@ -19,6 +19,7 @@ COPYING file for more details.
(** * Helper function and theorem for computing the rounded quotient of two floating-point numbers. *)
From Coq Require Import Lia.
Require Import Raux Defs Generic_fmt Float_prop Digits Bracket.
Set Implicit Arguments.
......@@ -80,7 +81,7 @@ assert ((F2R (Float beta m1 e1) / F2R (Float beta m2 e2) = IZR m1' / IZR m2' * b
destruct (Zle_bool e (e1 - e2)) eqn:He' ; injection Hm ; intros ; subst.
- split ; try easy.
apply Zle_bool_imp_le in He'.
rewrite mult_IZR, IZR_Zpower by omega.
rewrite mult_IZR, IZR_Zpower by lia.
unfold Zminus ; rewrite 2!bpow_plus, 2!bpow_opp.
field.
repeat split ; try apply Rgt_not_eq, bpow_gt_0.
......@@ -88,8 +89,8 @@ assert ((F2R (Float beta m1 e1) / F2R (Float beta m2 e2) = IZR m1' / IZR m2' * b
- apply Z.leb_gt in He'.
split ; cycle 1.
{ apply Z.mul_pos_pos with (1 := Hm2).
apply Zpower_gt_0 ; omega. }
rewrite mult_IZR, IZR_Zpower by omega.
apply Zpower_gt_0 ; lia. }
rewrite mult_IZR, IZR_Zpower by lia.
unfold Zminus ; rewrite bpow_plus, bpow_opp, bpow_plus, bpow_opp.
field.
repeat split ; try apply Rgt_not_eq, bpow_gt_0.
......@@ -113,7 +114,7 @@ destruct (Z_lt_le_dec 1 m2') as [Hm2''|Hm2''].
now apply IZR_neq, Zgt_not_eq.
field.
now apply IZR_neq, Zgt_not_eq.
- assert (r = 0 /\ m2' = 1)%Z as [-> ->] by (clear -Hr Hm2'' ; omega).
- assert (r = 0 /\ m2' = 1)%Z as [-> ->] by (clear -Hr Hm2'' ; lia).
unfold Rdiv.
rewrite Rmult_1_l, Rplus_0_r, Rinv_1, Rmult_1_r.
now constructor.
......@@ -150,10 +151,10 @@ unfold cexp.
destruct (Zle_lt_or_eq _ _ H1) as [H|H].
- replace (fexp (mag _ _)) with (fexp (e + 1)).
apply Z.le_min_r.
clear -H1 H2 H ; apply f_equal ; omega.
clear -H1 H2 H ; apply f_equal ; lia.
- replace (fexp (mag _ _)) with (fexp e).
apply Z.le_min_l.
clear -H1 H2 H ; apply f_equal ; omega.
clear -H1 H2 H ; apply f_equal ; lia.
Qed.
End Fcalc_div.
flocq/Calc/Operations.v
View file @ d4513f41
......@@ -17,7 +17,9 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
COPYING file for more details.
*)
(** Basic operations on floats: alignment, addition, multiplication *)
(** * Basic operations on floats: alignment, addition, multiplication *)
From Coq Require Import Lia.
Require Import Raux Defs Float_prop.
Set Implicit Arguments.
......@@ -50,7 +52,7 @@ case (Zle_bool e1 e2) ; intros He ; split ; trivial.
now rewrite <- F2R_change_exp.
rewrite <- F2R_change_exp.
apply refl_equal.
omega.
lia.
Qed.
Theorem Falign_spec_exp:
......
flocq/Calc/Round.v
View file @ d4513f41
......@@ -19,6 +19,7 @@ COPYING file for more details.
(** * Helper function for computing the rounded value of a real number. *)
From Coq Require Import Lia.
Require Import Core Digits Float_prop Bracket.
Section Fcalc_round.
......@@ -88,7 +89,7 @@ destruct Px as [Px|Px].
destruct Bx as [Bx1 Bx2].
apply lt_0_F2R in Bx1.
apply gt_0_F2R in Bx2.
omega.
lia.
Qed.
(** Relates location and rounding. *)
......@@ -585,7 +586,7 @@ apply Zlt_succ.
rewrite Zle_bool_true with (1 := Hm).
rewrite Zle_bool_false.
now case Rlt_bool.
omega.
lia.
Qed.
Definition truncate_aux t k :=
......@@ -674,7 +675,7 @@ unfold cexp.
rewrite mag_F2R_Zdigits.
2: now apply Zgt_not_eq.
unfold k in Hk. clear -Hk.
omega.
lia.
rewrite <- Hm', F2R_0.
apply generic_format_0.
Qed.
......@@ -717,14 +718,14 @@ simpl.
apply Zfloor_div.
intros H.
generalize (Zpower_pos_gt_0 beta k) (Zle_bool_imp_le _ _ (radix_prop beta)).
omega.
lia.
rewrite scaled_mantissa_generic with (1 := Fx).
now rewrite Zfloor_IZR.
(* *)
split.
apply refl_equal.
unfold k in Hk.
omega.
lia.
Qed.
Theorem truncate_correct_partial' :
......@@ -744,7 +745,7 @@ destruct Zlt_bool ; intros Hk.
now apply inbetween_float_new_location.
ring.
- apply (conj H1).
omega.
lia.
Qed.
Theorem truncate_correct_partial :
......@@ -790,7 +791,7 @@ intros x m e l [Hx|Hx] H1 H2.
destruct Zlt_bool.
intros H.
apply False_ind.
omega.
lia.
intros _.
apply (conj H1).
right.
......@@ -803,7 +804,7 @@ intros x m e l [Hx|Hx] H1 H2.
rewrite mag_F2R_Zdigits with (1 := Zm).
now apply Zlt_le_weak.
- assert (Hm: m = 0%Z).
cut (m <= 0 < m + 1)%Z. omega.
cut (m <= 0 < m + 1)%Z. lia.
assert (F2R (Float beta m e) <= x < F2R (Float beta (m + 1) e))%R as Hx'.
apply inbetween_float_bounds with (1 := H1).
rewrite <- Hx in Hx'.
......@@ -1156,7 +1157,7 @@ exact H1.
unfold k in Hk.
destruct H2 as [H2|H2].
left.
omega.
lia.
right.
split.
exact H2.
......@@ -1165,7 +1166,7 @@ inversion_clear H1.
rewrite H.
apply generic_format_F2R.
unfold cexp.
omega.
lia.
Qed.
End Fcalc_round.
flocq/Calc/Sqrt.v
View file @ d4513f41
......@@ -19,6 +19,7 @@ COPYING file for more details.
(** * Helper functions and theorems for computing the rounded square root of a floating-point number. *)
From Coq Require Import Lia.
Require Import Raux Defs Digits Generic_fmt Float_prop Bracket.
Set Implicit Arguments.
......@@ -86,7 +87,7 @@ assert (sqrt (F2R (Float beta m1 e1)) = sqrt (IZR m') * bpow e)%R as Hf.
{ rewrite <- (sqrt_Rsqr (bpow e)) by apply bpow_ge_0.
rewrite <- sqrt_mult.
unfold Rsqr, m'.
rewrite mult_IZR, IZR_Zpower by omega.
rewrite mult_IZR, IZR_Zpower by lia.
rewrite Rmult_assoc, <- 2!bpow_plus.
now replace (_ + _)%Z with e1 by ring.
now apply IZR_le.
......@@ -106,7 +107,7 @@ fold (Rsqr (IZR q)).
rewrite sqrt_Rsqr.
now constructor.
apply IZR_le.
clear -Hr ; omega.
clear -Hr ; lia.
(* .. r <> 0 *)
constructor.
split.
......@@ -117,14 +118,14 @@ fold (Rsqr (IZR q)).
rewrite sqrt_Rsqr.
apply Rle_refl.
apply IZR_le.
clear -Hr ; omega.
clear -Hr ; lia.
apply sqrt_lt_1.
rewrite mult_IZR.
apply Rle_0_sqr.
rewrite <- Hq.
now apply IZR_le.
apply IZR_lt.
omega.
lia.
apply Rlt_le_trans with (sqrt (IZR ((q + 1) * (q + 1)))).
apply sqrt_lt_1.
rewrite <- Hq.
......@@ -133,13 +134,13 @@ rewrite mult_IZR.
apply Rle_0_sqr.
apply IZR_lt.
ring_simplify.
omega.
lia.
rewrite mult_IZR.
fold (Rsqr (IZR (q + 1))).
rewrite sqrt_Rsqr.
apply Rle_refl.
apply IZR_le.
clear -Hr ; omega.
clear -Hr ; lia.
(* ... location *)
rewrite Rcompare_half_r.
generalize (Rcompare_sqr (2 * sqrt (IZR (q * q + r))) (IZR q + IZR (q + 1))).
......@@ -154,14 +155,14 @@ replace ((q + (q + 1)) * (q + (q + 1)))%Z with (4 * (q * q) + 4 * q + 1)%Z by ri
generalize (Zle_cases r q).
case (Zle_bool r q) ; intros Hr''.
change (4 * (q * q + r) < 4 * (q * q) + 4 * q + 1)%Z.
omega.
lia.
change (4 * (q * q + r) > 4 * (q * q) + 4 * q + 1)%Z.
omega.
lia.
rewrite <- Hq.
now apply IZR_le.
rewrite <- plus_IZR.
apply IZR_le.
clear -Hr ; omega.
clear -Hr ; lia.
apply Rmult_le_pos.
now apply IZR_le.
apply sqrt_ge_0.
......@@ -188,7 +189,7 @@ set (e := Z.min _ _).
assert (2 * e <= e1)%Z as He.
{ assert (e <= Z.div2 e1)%Z by apply Z.le_min_r.
rewrite (Zdiv2_odd_eqn e1).
destruct Z.odd ; omega. }
destruct Z.odd ; lia. }
generalize (Fsqrt_core_correct m1 e1 e Hm1 He).
destruct Fsqrt_core as [m l].
apply conj.
......
flocq/Core/Defs.v
View file @ d4513f41
......@@ -80,4 +80,8 @@ Definition Rnd_NA_pt (F : R -> Prop) (x f : R) :=
Rnd_N_pt F x f /\
forall f2 : R, Rnd_N_pt F x f2 -> (Rabs f2 <= Rabs f)%R.
Definition Rnd_N0_pt (F : R -> Prop) (x f : R) :=
Rnd_N_pt F x f /\
forall f2 : R, Rnd_N_pt F x f2 -> (Rabs f <= Rabs f2)%R.
End RND.
flocq/Core/Digits.v
View file @ d4513f41
......@@ -17,8 +17,13 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
COPYING file for more details.
*)
Require Import ZArith Zquot.
From Coq Require Import Lia ZArith Zquot.
Require Import Zaux.
Require Import SpecFloatCompat.
Notation digits2_pos := digits2_pos (only parsing).
Notation Zdigits2 := Zdigits2 (only parsing).
(** Number of bits (radix 2) of a positive integer.
......@@ -41,9 +46,9 @@ intros n d. unfold d. clear.
assert (Hp: forall m, (Zpower_nat 2 (S m) = 2 * Zpower_nat 2 m)%Z) by easy.
induction n ; simpl digits2_Pnat.
rewrite Zpos_xI, 2!Hp.
omega.
lia.
rewrite (Zpos_xO n), 2!Hp.
omega.
lia.
now split.
Qed.
......@@ -185,13 +190,13 @@ apply Zgt_not_eq.
now apply Zpower_gt_0.
now apply Zle_minus_le_0.
destruct (Zle_or_lt 0 k) as [H0|H0].
rewrite (Zdigit_lt n) by omega.
rewrite (Zdigit_lt n) by lia.
unfold Zdigit.
replace k' with (k' - k + k)%Z by ring.
rewrite Zpower_plus with (2 := H0).
rewrite Zmult_assoc, Z_quot_mult.
replace (k' - k)%Z with (k' - k - 1 + 1)%Z by ring.
rewrite Zpower_exp by omega.
rewrite Zpower_exp by lia.
rewrite Zmult_assoc.
change (Zpower beta 1) with (beta * 1)%Z.
rewrite Zmult_1_r.
......@@ -203,7 +208,7 @@ now apply Zlt_le_weak.
rewrite Zdigit_lt with (1 := H0).
apply sym_eq.
apply Zdigit_lt.
omega.
lia.
Qed.
Theorem Zdigit_div_pow :
......@@ -227,7 +232,7 @@ unfold Zdigit.
rewrite <- 2!ZOdiv_mod_mult.
apply (f_equal (fun x => Z.quot x (beta ^ k))).
replace k' with (k + 1 + (k' - (k + 1)))%Z by ring.
rewrite Zpower_exp by omega.
rewrite Zpower_exp by lia.
rewrite Zmult_comm.
rewrite Zpower_plus by easy.
change (Zpower beta 1) with (beta * 1)%Z.
......@@ -449,7 +454,7 @@ unfold Zscale.
case Zle_bool_spec ; intros Hk.
now apply Zdigit_mul_pow.
apply Zdigit_div_pow with (1 := Hk').
omega.
lia.
Qed.
Theorem Zscale_0 :
......@@ -492,7 +497,7 @@ now rewrite Zpower_plus.
now apply Zplus_le_0_compat.
case Zle_bool_spec ; intros Hk''.
pattern k at 1 ; replace k with (k + k' + -k')%Z by ring.
assert (0 <= -k')%Z by omega.
assert (0 <= -k')%Z by lia.
rewrite Zpower_plus by easy.
rewrite Zmult_assoc, Z_quot_mult.
apply refl_equal.
......@@ -503,7 +508,7 @@ rewrite Zpower_plus with (2 := Hk).
apply Zquot_mult_cancel_r.
apply Zgt_not_eq.
now apply Zpower_gt_0.
omega.
lia.
Qed.
Theorem Zscale_scale :
......@@ -532,7 +537,7 @@ rewrite Zdigit_mod_pow by apply Hk.
rewrite Zdigit_scale by apply Hk.
unfold Zminus.
now rewrite Z.opp_involutive, Zplus_comm.
omega.
lia.
Qed.
Theorem Zdigit_slice_out :
......@@ -589,16 +594,16 @@ destruct (Zle_or_lt k2' k) as [Hk''|Hk''].
now apply Zdigit_slice_out.
rewrite Zdigit_slice by now split.
apply Zdigit_slice_out.
zify ; omega.
rewrite Zdigit_slice by (zify ; omega).
zify ; lia.
rewrite Zdigit_slice by (zify ; lia).
rewrite (Zdigit_slice n (k1 + k1')) by now split.
rewrite Zdigit_slice.
now rewrite Zplus_assoc.
zify ; omega.
zify ; lia.
unfold Zslice.
rewrite Z.min_r.
now rewrite Zle_bool_false.
omega.
lia.
Qed.
Theorem Zslice_mul_pow :
......@@ -624,14 +629,14 @@ case Zle_bool_spec ; intros Hk2.
apply (f_equal (fun x => Z.rem x (beta ^ k2))).
unfold Zscale.
case Zle_bool_spec ; intros Hk1'.
replace k1 with Z0 by omega.
replace k1 with Z0 by lia.
case Zle_bool_spec ; intros Hk'.
replace k with Z0 by omega.
replace k with Z0 by lia.
simpl.
now rewrite Z.quot_1_r.
rewrite Z.opp_involutive.
apply Zmult_1_r.
rewrite Zle_bool_false by omega.
rewrite Zle_bool_false by lia.
rewrite 2!Z.opp_involutive, Zplus_comm.
rewrite Zpower_plus by assumption.
apply Zquot_Zquot.
......@@ -646,7 +651,7 @@ unfold Zscale.
case Zle_bool_spec; intros Hk.
now apply Zslice_mul_pow.
apply Zslice_div_pow with (2 := Hk1).
omega.
lia.
Qed.
Theorem Zslice_div_pow_scale :
......@@ -666,7 +671,7 @@ apply Zdigit_slice_out.
now apply Zplus_le_compat_l.
rewrite Zdigit_slice by now split.
destruct (Zle_or_lt 0 (k1 + k')) as [Hk1'|Hk1'].
rewrite Zdigit_slice by omega.
rewrite Zdigit_slice by lia.
rewrite Zdigit_div_pow by assumption.
apply f_equal.
ring.
......@@ -685,15 +690,15 @@ rewrite Zdigit_plus.
rewrite Zdigit_scale with (1 := Hk).
destruct (Zle_or_lt (l1 + l2) k) as [Hk2|Hk2].
rewrite Zdigit_slice_out with (1 := Hk2).
now rewrite 2!Zdigit_slice_out by omega.
now rewrite 2!Zdigit_slice_out by lia.
rewrite Zdigit_slice with (1 := conj Hk Hk2).
destruct (Zle_or_lt l1 k) as [Hk1|Hk1].
rewrite Zdigit_slice_out with (1 := Hk1).
rewrite Zdigit_slice by omega.
rewrite Zdigit_slice by lia.
simpl ; apply f_equal.
ring.
rewrite Zdigit_slice with (1 := conj Hk Hk1).
rewrite (Zdigit_lt _ (k - l1)) by omega.
rewrite (Zdigit_lt _ (k - l1)) by lia.
apply Zplus_0_r.
rewrite Zmult_comm.
apply Zsame_sign_trans_weak with n.
......@@ -713,7 +718,7 @@ left.
now apply Zdigit_slice_out.
right.
apply Zdigit_lt.
omega.
lia.
Qed.
Section digits_aux.
......@@ -788,7 +793,7 @@ pattern (radix_val beta) at 2 5 ; replace (radix_val beta) with (Zpower beta 1)
rewrite <- Zpower_plus.
rewrite Zplus_comm.
apply IHu.
clear -Hv ; omega.
clear -Hv ; lia.
split.
now ring_simplify (1 + v - 1)%Z.
now rewrite Zplus_assoc.
......@@ -928,7 +933,7 @@ intros x y Zx Hxy.
assert (Hx := Zdigits_correct x).
assert (Hy := Zdigits_correct y).
apply (Zpower_lt_Zpower beta).
zify ; omega.
zify ; lia.
Qed.
Theorem lt_Zdigits :
......@@ -938,7 +943,7 @@ Theorem lt_Zdigits :
(x < y)%Z.
Proof.
intros x y Hy.
cut (y <= x -> Zdigits y <= Zdigits x)%Z. omega.
cut (y <= x -> Zdigits y <= Zdigits x)%Z. lia.
now apply Zdigits_le.
Qed.
......@@ -951,7 +956,7 @@ intros e x Hex.
destruct (Zdigits_correct x) as [H1 H2].
apply Z.le_trans with (2 := H1).
apply Zpower_le.
clear -Hex ; omega.
clear -Hex ; lia.
Qed.