simp[HAdd.hAdd,Add.add]
Cont : Type u_2
Idx : outParam (Type u_3)
Elem : outParam (Type u_1)
inst✝⁴ : IndexType Idx
inst✝³ : outParam (DecidableEq Idx)
inst✝² : LawfulIndexType Idx
inst✝¹ : ArrayType Cont Idx Elem
inst✝ : Add Elem
x y : Cont
i : Idx
⊢ (x + y)[i] = x[i] + y[i]
no goals