m n : Num
x✝ : ↑m ∣ ↑n
k : ℕ
e : ↑n = ↑m * k
⊢ ↑(↑m * k) = m * ↑k
m n : Num
x✝ : ↑m ∣ ↑n
k : ℕ
e : ↑n = ↑m * k
⊢ n = m * ↑k
rw [← of_to_nat n, e]
no goals
m n : Num
x✝ : ↑m ∣ ↑n
k : ℕ
e : ↑n = ↑m * k
⊢ ↑(↑m * k) = m * ↑k
simp
no goals
m n : Num
x✝ : m ∣ n
k : Num
e : n = m * k
⊢ ↑n = ↑m * ↑k
simp [e, mul_to_nat]