diff options
Diffstat (limited to 'theories/Numbers/Natural/Abstract/NLcm.v')
| -rw-r--r-- | theories/Numbers/Natural/Abstract/NLcm.v | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/theories/Numbers/Natural/Abstract/NLcm.v b/theories/Numbers/Natural/Abstract/NLcm.v index 321508f58..1e8e678c6 100644 --- a/theories/Numbers/Natural/Abstract/NLcm.v +++ b/theories/Numbers/Natural/Abstract/NLcm.v @@ -30,9 +30,9 @@ Module Type NLcmProp Lemma mod_divide : forall a b, b~=0 -> (a mod b == 0 <-> (b|a)). Proof. intros a b Hb. split. - intros Hab. exists (a/b). rewrite (div_mod a b Hb) at 2. - rewrite Hab; now nzsimpl. - intros (c,Hc). rewrite <- Hc, mul_comm. now apply mod_mul. + intros Hab. exists (a/b). rewrite mul_comm. + rewrite (div_mod a b Hb) at 1. rewrite Hab; now nzsimpl. + intros (c,Hc). rewrite Hc. now apply mod_mul. Qed. Lemma divide_div_mul_exact : forall a b c, b~=0 -> (b|a) -> @@ -132,7 +132,7 @@ Qed. Lemma divide_div : forall a b c, a~=0 -> (a|b) -> (b|c) -> (b/a|c/a). Proof. intros a b c Ha Hb (c',Hc). exists c'. - now rewrite mul_comm, <- divide_div_mul_exact, mul_comm, Hc. + now rewrite <- divide_div_mul_exact, Hc. Qed. Lemma lcm_least : forall a b c, @@ -146,14 +146,14 @@ Proof. set (g:=gcd a b) in *. assert (Ha' := divide_div g a c NEQ Ga Ha). assert (Hb' := divide_div g b c NEQ Gb Hb). - destruct Ha' as (a',Ha'). rewrite <- Ha' in Hb'. + destruct Ha' as (a',Ha'). rewrite Ha', mul_comm in Hb'. apply gauss in Hb'; [|apply gcd_div_gcd; unfold g; trivial using gcd_comm]. destruct Hb' as (b',Hb'). exists b'. - rewrite <- mul_assoc, Hb'. + rewrite mul_shuffle3, <- Hb'. rewrite (proj2 (div_exact c g NEQ)). - rewrite <- Ha', mul_assoc. f_equiv. - apply div_exact; trivial. + rewrite Ha', mul_shuffle3, (mul_comm a a'). f_equiv. + symmetry. apply div_exact; trivial. apply mod_divide; trivial. apply mod_divide; trivial. transitivity a; trivial. Qed. |