∀ (𝕜 : Type u) {ι : Type v} (E : ι → Type wE) (G : Type wG) (G' : Type wG') [inst : NontriviallyNormedField 𝕜]
  [inst_1 : (i : ι) → SeminormedAddCommGroup (E i)] [inst_2 : (i : ι) → NormedSpace 𝕜 (E i)]
  [inst_3 : SeminormedAddCommGroup G] [inst_4 : NormedSpace 𝕜 G] [inst_5 : SeminormedAddCommGroup G']
  [inst_6 : NormedSpace 𝕜 G'] [inst_7 : Fintype ι] (a : ContinuousMultilinearMap 𝕜 E (G × G')),
  (ContinuousMultilinearMap.prodL 𝕜 E G G').symm a = ContinuousMultilinearMap.prodEquiv.invFun a