∀ {ι : Type u_1} {R : Type u_2} {M : Type u_3} {N : Type u_4} [inst : CommRing R] [inst_1 : AddCommGroup M]
  [inst_2 : Module R M] [inst_3 : AddCommGroup N] [inst_4 : Module R N] {P : RootPairing ι R M N}
  [inst_5 : P.EmbeddedG2] (B : P.InvariantForm),
  (B.form (RootPairing.EmbeddedG2.twoShortAddLongRoot P)) (RootPairing.EmbeddedG2.twoShortAddLongRoot P) =
    (B.form (RootPairing.EmbeddedG2.shortRoot P)) (RootPairing.EmbeddedG2.shortRoot P)