∀ {K : Type u_1} [inst : DivisionRing K] [inst_1 : LinearOrder K] [inst_2 : IsOrderedRing K] [inst_3 : Archimedean K]
  {M : Type u_2} [inst_4 : AddCommGroup M] [inst_5 : LinearOrder M] [inst_6 : IsOrderedAddMonoid M]
  [inst_7 : Module K M] [inst_8 : IsOrderedModule K M] {R : Type u_3} [inst_9 : AddCommGroup R]
  [inst_10 : LinearOrder R] [inst_11 : Module K R] {seed : HahnEmbedding.Seed K M R} (f : HahnEmbedding.Partial seed)
  [IsOrderedAddMonoid R] [Archimedean R] {x : ↥(↑f).domain} (hx0 : ↑x ≠ 0),
  (ofLex (↑↑f x)).coeff (FiniteArchimedeanClass.mk (↑x) hx0) ≠ 0