∀ (R : Type u_9) [inst : Semiring R] (S : Type u_10) (T : Type u_11) (A : S ⊕ T → Type u_12)
  [inst_1 : (st : S ⊕ T) → AddCommMonoid (A st)] [inst_2 : (st : S ⊕ T) → Module R (A st)],
  ⇑(LinearEquiv.sumPiEquivProdPi R S T A).symm = ⇑(Equiv.sumPiEquivProdPi A).symm