Specialization at t=-234/95 of a generic rank-four Mordell family generated from the Burkhardt parametrization, using construction parameters (-9,-1,0).
The specialization was selected by the common 328-prime Mestre–Nagao sieve in a coordinated search across multiple Burkhardt families and the rank-five quadratic base-change family.
PARI/GP 2.17.4 returned matching computational rank bounds [9,9].
jesper-petersen ·