The topic of this seminar are algebraic curves of degree three - cubic curves and their flexes. We study properties of curves and introduce Abelian group structure on the points of a nonsingular cubic and also on the flexes. We explain how to calculate the 9 flexes explicitely from the coefficients of a curve. To show that the calculation is always possible, we prove the solvability of the Galois group of flexes. Given a flex on a cubic curve, it is possible to put the curve into Weierstrass form using projective transformations.
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