exact this
α : Type u
as bs : Array α
has : Nodup as
hbs : Nodup bs
hdisj : ∀ (i j : Nat) (hi : i < size as) (hj : j < size bs), as[i] ≠ bs[j]
i j : Nat
hi : i < size (as ++ bs)
hj : j < size (as ++ bs)
hi' : ¬i < size as
hi'' : i ≥ size as
this✝¹ : i - size as < size bs
hj' : ¬j < size as
hj'' : j ≥ size as
this✝ : j - size as < size bs
h : bs[i - size as] = bs[j - size as]
this : i = j
⊢ i = j
no goals