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This commit is contained in:
Thomas Baruchel 2023-01-04 19:39:59 +01:00
parent 79f9525fbd
commit 30eef734bc
1 changed files with 3 additions and 3 deletions
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src/thue_morse.v
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@ -266,11 +266,11 @@ Proof.
intros l hd tl. intros H I.
assert (J: hd = tm_morphism (firstn (Nat.div2 (length hd)) l)).
generalize I. generalize H. apply tm_morphism_app2.
assert (K: l = (firstn (Nat.div2 (length hd)) l) ++ (skipn (Nat.div2 (length hd)) l)).
symmetry. apply firstn_skipn.
assert (K: (firstn (Nat.div2 (length hd)) l) ++ (skipn (Nat.div2 (length hd)) l) = l).
apply firstn_skipn.
assert (L: tm_morphism l = (tm_morphism (firstn (Nat.div2 (length hd)) l))
++ (tm_morphism (skipn (Nat.div2 (length hd)) l))).
rewrite K at 1. apply tm_morphism_app.
rewrite <- K at 1. apply tm_morphism_app.
rewrite H in L. rewrite <- J in L.
rewrite app_inv_head_iff in L. assumption.
Qed.