A Lie Algebra Method for Rational Parametrization of Severi-Brauer Surfaces
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math.AG
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pointrationalseveri-braueralgebraalgorithmisomorphismplaneprojective
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It is well-known that a Severi-Brauer surface has a rational point if and only if it is isomorphic to the projective plane. Given a Severi-Brauer surface, we study the problem to decide whether such an isomorphism to the projective plane, or such a rational point, does exist; and to construct such an isomorphism or such a point in the affirmative case. We give an algorithm using Lie algebra techniques. The algorithm has been implemented in Magma.
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