A conjugation-stable five-dimensional W ⊇ span(1, u, u⁻¹) of type D1 contains u², ū² or 1/(u − a), or is a real pencil space W(λ, f)

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A conjugation-stable five-dimensional W ⊇ span(1, u, u⁻¹) of type D1 contains u², ū² or 1/(u − a), or is a real pencil space W(λ, f) · Prove2Me