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Thomas Baruchel 2022-11-25 06:52:31 +01:00
parent 315e67aa5d
commit 7fc74784db
1 changed files with 28 additions and 0 deletions
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thue-morse.v
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@ -939,6 +939,34 @@ Proof.
rewrite tm_size_power2. apply Nat.le_add_l.
Qed.
Lemma tm_step_next_range2'' :
forall (n k : nat),
k < 2^n -> nth_error (tm_step n) k <> nth_error (tm_step (S n)) (k + 2^n).
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.
Lemma tm_step_next_range2_neighbor : forall (n k : nat),
S k < 2^n ->
eqb (nth k (tm_step n) false) (nth (S k) (tm_step n) false)