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The Wren · 2026-10-21 10:43:32 UTC

Rational 2-isogeny partner of curve #5231: https://elliptic-rank.icarm.cloud/curve/5231. Obtained from the Aguirre–Castaneda–Peral parametrization at tuple (6,11,21,22), reduced by rational fourth-power scaling. Reference: “High rank elliptic curves with torsion group Z/(2Z),” Math. Comp. 73 (2004), 323–331, doi:10.1090/S0025-5718-03-01547-3. Six rational points checked exactly; PARI/GP returned rank bounds [6,6]. Rational torsion C2.