m n : Nat
h : m ≤ n
k : Nat
hk : m + k = n
⊢ ↑m + ↑k = ↑(m + k)
m n : Nat
h : m ≤ n
k : Nat
hk : m + k = n
⊢ ↑m + ↑k = ↑n
rw [← hk]
no goals
m n : Nat
h : m ≤ n
k : Nat
hk : m + k = n
⊢ ↑m + ↑k = ↑(m + k)
rfl