NormalizationMonoid.normUnit_mul_units

∀ {α : Type u_2} {inst : MonoidWithZero α} [self : NormalizationMonoid α] {a : α} (u : αˣ),
  a ≠ 0 → normUnit (a * ↑u) = u⁻¹ * normUnit a

The condition that ensures associated elements are normalized to the same element.

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