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curve #272

y2 = x3 + 1190790012412
a-invariants
[0, 0, 0, 0, 1190790012412]
rank (lower bound)
≥ 6
conductor (N)
35280726487742736
naive height
69.1344
Faltings height
3.8189
discriminant (Δ)
-612567728781193921272945408
primes of bad reduction
2, 3, 7, 11, 13, 19, 823
regulator
1643.7083603849346516610625128373530480382179836418
submitted by
sorinmg
submitted at
2026-08-18 22:06:22 UTC
last updated
2026-08-18 22:06:22 UTC

Witness: 6 independent points

Commentary

This is the Mordell curve E : y² = x³ + 1190790012412, with 1190790012412 = 38038²·823 = 2²·7²·11²·13²·19²·823. It has j(E)=0 and geometric complex multiplication by Z[ζ₃], while End_Q(E)=Z; equivalently, E is a sextic twist of y²=x³+1. The minimal discriminant is Δ = -612567728781193921272945408 = -2⁸·3³·7⁴·11⁴·13⁴·19⁴·823², and the bad primes are 2,3,7,11,13,19,823. Their Kodaira types are respectively I₀*, III, IV, IV, IV, IV, II. The conductor is N = 35280726487742736 = 2⁴·3²·7²·11²·13²·19²·823², and the Tamagawa product is 324. Rational torsion is trivial: #E(F₅)=6 and #E(F₃₁)=43, whose gcd is 1. Six independent rational integral points give rank(E/Q) ≥ 6, while the supplied PARI/GP computation gives the matching upper bound, hence rank(E/Q)=6 and E(Q) ≅ Z⁶. The submitted six-point lattice agrees with the PARI generator lattice via an integral transition matrix of determinant 1. It has been saturated at ℓ=2,3,5,7,11,13. Therefore, if its index i in the full Mordell-Weil group is greater than 1, every prime divisor of i is at least 17. The displayed height determinant 1643.70836038493465... is the regulator of this rank-6 lattice; the global regulator is det(H)/i². A rational 3-isogeny exists to E' : Y² = X³ - 32151330335124, with X = (x³+4B)/x², Y = y(x³-8B)/x³. Its geometric kernel is {O,(0,±38038√823)}, a Galois-stable subgroup defined over Q(√823). Consequently E' also has rank 6 over Q. An exhaustive integral search for -10599 ≤ x ≤ 10¹¹ finds exactly 30 points with y>0 (60 after sign symmetry). Independently, searching combinations of the Mordell-Weil generators with coefficients -5≤n_i≤5 produces exactly the same 30 positive integral points. ΩE​≈0.0408588818808802051405413396566268225117823… so... " i think" it's a real testing ground / candidate for BSD

last edited by sorinmg at 2026-08-18 22:58:10 UTC · history

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