For a real Laurent polynomial f in u/s of width k: if k ≥ 3, or k = 2 and f(−λ̄) ≠ 0, the real pencil space W(λ, f) contains none of u², ū², 1/(u − b)

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For a real Laurent polynomial f in u/s of width k: if k ≥ 3, or k = 2 and f(−λ̄) ≠ 0, the real pencil space W(λ, f) contains none of u², ū², 1/(u − b) · Prove2Me