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Thomas Baruchel 2022-11-23 10:19:48 +01:00
parent 84a71a9e9d
commit 0c970f9666
1 changed files with 7 additions and 9 deletions
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thue-morse.v
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@ -863,16 +863,14 @@ Proof.
Qed. Qed.
Lemma tm_step_next_range' : Lemma tm_step_next_range' :
forall (n k : nat) (l1 l2 : list bool) (b : bool), forall (n k : nat) (b : bool),
tm_step n = l1 ++ b :: l2 nth_error (tm_step n) k = Some b -> nth_error (tm_step (S n)) k = Some b.
-> nth_error (tm_step (n + k)) (length l1) = Some b.
Proof. Proof.
intros n k l1 l2 b. intros H. intros n k b. intros H. assert (I := H).
induction k. apply nth_error_split in H. destruct H. destruct H. inversion H.
- rewrite Nat.add_0_r. generalize H. apply list_concat_to_pos. rewrite tm_build. rewrite nth_error_app1. apply I.
- rewrite Nat.add_succ_r. apply list_app_length_lt in H0. rewrite H1 in H0. apply H0.
simpl. Qed.
apply nth_error_split in IHk.