The space span(1, u, ū, g, ug) is visible to the four-dimensional extensions exactly when u·R(u)·g = N(u) with R ≠ 0, deg R ≤ 2, deg N ≤ 3

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The space span(1, u, ū, g, ug) is visible to the four-dimensional extensions exactly when u·R(u)·g = N(u) with R ≠ 0, deg R ≤ 2, deg N ≤ 3 · Prove2Me