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Hilbert 90 for Biquadratic Extensions

Hilbert 90 for Biquadratic Extensions

Here something stubborn comes, Dislodging the earth crumbs And making crusty rubble. It comes up bending double, And looks like a green staple. It could be seedling maple, Or artichoke, or bean. That remains to be seen.—Richard Wilbur, "Seed Leaves"