Obtained from ICARM curve #1105, a rank-at-least-4 curve with torsion \(\mathbf Z/12\mathbf Z\), found by Tom Fisher (2008). Quotienting by its unique rational point of order 2 gives a 2-isogenous curve whose global minimal model has ainvs \([1,0,0,-1148701945424064481425859592208024187458738800,-13425175949192314803770353966641412474743403547822354677669726560000]\), torsion \(\mathbf Z/2\mathbf Z\times\mathbf Z/6\mathbf Z\), and conductor \(358210529915244759591648810\). The four independent source points were mapped through the isogeny, yielding four independent points on the quotient. The isogeny, minimal model, conductor, torsion and image points were verified in Magma.
jesper-petersen ·