# Elementary 3-descent with a 3-isogeny

@article{Cohen2009Elementary3W, title={Elementary 3-descent with a 3-isogeny}, author={Henri Cohen and Fabien Pazuki}, journal={Acta Arithmetica}, year={2009}, volume={140}, pages={369-404} }

In this expository paper, we show how to use in practice 3-descent with a 3-isogeny to find an estimate for the rank of an elliptic curve having a rational 3-torsion subgroup, and we also give a geometric interpretation of these computations.

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