∀ {K : Type u_1} [inst : Field K] [inst_1 : NumberField K] {x : NumberField.mixedEmbedding.mixedSpace K},
  x ∈ NumberField.mixedEmbedding.fundamentalCone.normLeOne K ↔
    x ∈ NumberField.mixedEmbedding.fundamentalCone K ∧ NumberField.mixedEmbedding.norm x ≤ 1