diff options
| -rw-r--r-- | hott/Nat.thy | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/hott/Nat.thy b/hott/Nat.thy index 4825404..311f2d9 100644 --- a/hott/Nat.thy +++ b/hott/Nat.thy @@ -104,7 +104,7 @@ Lemma (derive) add_comm: proof reduce have "suc (m + n) = suc (n + m)" by (eq ih) intro also have "'' = n + suc m" by (rule add_suc[symmetric]) - finally show "suc (m + n) = n + suc m" by this reduce + finally show "suc (m + n) = n + suc m" by this qed done |