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This commit is contained in:
Thomas Baruchel 2022-11-25 07:05:27 +01:00
parent 7fc74784db
commit 7c36b66a21
1 changed files with 6 additions and 11 deletions
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17
thue-morse.v
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@ -946,20 +946,15 @@ Proof.
intros n k. intros H.
rewrite tm_build.
rewrite nth_error_app2. rewrite tm_size_power2. rewrite Nat.add_sub.
assert (nth_error (tm_step n) k = Some (nth k (tm_step n) false)).
generalize H. rewrite <- tm_size_power2. apply nth_error_nth'.
rewrite H0.
assert (nth_error (map negb (tm_step n)) k =
Some (negb (nth k (tm_step n) false))).
generalize H0. apply map_nth_error.
rewrite H1.
destruct (nth_error (tm_step n) k). rewrite <- H0. rewrite <- H0.
assert (nth_error (map negb (tm_step n)) k
= Some (negb (nth k (tm_step n) false))).
generalize H0. apply map_nth_error. rewrite H1.
destruct (nth k (tm_step n) false). easy. easy.
rewrite tm_size_power2. apply Nat.le_add_l.
Qed.