Some Improvements to 4-Descent on an Elliptic Curve
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- Fisher T. (2008) Some Improvements to 4-Descent on an Elliptic Curve. In: van der Poorten A.J., Stein A. (eds) Algorithmic Number Theory. ANTS 2008. Lecture Notes in Computer Science, vol 5011. Springer, Berlin, Heidelberg
The theory of 4-descent on elliptic curves has been developed in the PhD theses of Siksek , Womack  and Stamminger . Prompted by our use of 4-descent in the search for generators of large height on elliptic curves of rank at least 2, we explain how to cut down the number of class group and unit group calculations required, by using the group law on the 4-Selmer group.
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