named Statements are added to context with there specified name

2023-04-14 10:48:46 +02:00
parent 0560c0100b
commit b1dc4d71b3
12 changed files with 37 additions and 73 deletions
@@ -1,13 +0,0 @@
-import Adam.Options.MathlibPart
-
-open BigOperators
-
-lemma arithmetic_sum (n : ℕ) : 2 * (∑ i : Fin (n + 1), ↑i) = n * (n + 1) := by
-  induction' n with n hn
-  simp
-  rw [Fin.sum_univ_castSucc]
-  rw [mul_add]
-  simp
-  rw [mul_add, hn]
-  simp_rw [Nat.succ_eq_one_add]
-  ring