Minimal Weierstrass equation
Minimal Weierstrass equation
Simplified equation
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\(y^2=x^3-x^2-1920800x+1025280000\)
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(homogenize, simplify) |
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\(y^2z=x^3-x^2z-1920800xz^2+1025280000z^3\)
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(dehomogenize, simplify) |
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\(y^2=x^3-155584827x+746962365546\)
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(homogenize, minimize) |
Mordell-Weil group structure
\(\Z/{2}\Z \oplus \Z/{4}\Z\)
Mordell-Weil generators
| $P$ | $\hat{h}(P)$ | Order |
|---|---|---|
| $(800, 0)$ | $0$ | $2$ |
| $(850, 2450)$ | $0$ | $4$ |
Integral points
\( \left(-1600, 0\right) \), \((752,\pm 2352)\), \( \left(800, 0\right) \), \( \left(801, 0\right) \), \((850,\pm 2450)\)
Invariants
| Conductor: | $N$ | = | \( 1680 \) | = | $2^{4} \cdot 3 \cdot 5 \cdot 7$ |
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| Discriminant: | $\Delta$ | = | $531284060160000$ | = | $2^{14} \cdot 3^{2} \cdot 5^{4} \cdot 7^{8} $ |
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| j-invariant: | $j$ | = | \( \frac{191342053882402567201}{129708022500} \) | = | $2^{-2} \cdot 3^{-2} \cdot 5^{-4} \cdot 7^{-8} \cdot 73^{3} \cdot 193^{3} \cdot 409^{3}$ |
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| Endomorphism ring: | $\mathrm{End}(E)$ | = | $\Z$ | |||
| Geometric endomorphism ring: | $\mathrm{End}(E_{\overline{\Q}})$ | = | \(\Z\) (no potential complex multiplication) |
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| Sato-Tate group: | $\mathrm{ST}(E)$ | = | $\mathrm{SU}(2)$ | |||
| Faltings height: | $h_{\mathrm{Faltings}}$ | ≈ | $2.1410030071755357016616543081$ |
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| Stable Faltings height: | $h_{\mathrm{stable}}$ | ≈ | $1.4478558266155903922444221866$ |
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| $abc$ quality: | $Q$ | ≈ | $1.05504045380176$ | |||
| Szpiro ratio: | $\sigma_{m}$ | ≈ | $7.408334609879248$ | |||
BSD invariants
| Analytic rank: | $r_{\mathrm{an}}$ | = | $ 0$ |
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| Mordell-Weil rank: | $r$ | = | $ 0$ |
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| Regulator: | $\mathrm{Reg}(E/\Q)$ | = | $1$ |
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| Real period: | $\Omega$ | ≈ | $0.43090287435849486501128292544$ |
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| Tamagawa product: | $\prod_{p}c_p$ | = | $ 256 $ = $ 2^{2}\cdot2\cdot2^{2}\cdot2^{3} $ |
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| Torsion order: | $\#E(\Q)_{\mathrm{tor}}$ | = | $8$ |
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| Special value: | $ L(E,1)$ | ≈ | $1.7236114974339794600451317018 $ |
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| Analytic order of Ш: | Ш${}_{\mathrm{an}}$ | = | $1$ (exact) |
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BSD formula
$$\begin{aligned} 1.723611497 \approx L(E,1) & = \frac{\# ะจ(E/\Q)\cdot \Omega_E \cdot \mathrm{Reg}(E/\Q) \cdot \prod_p c_p}{\#E(\Q)_{\rm tor}^2} \\ & \approx \frac{1 \cdot 0.430903 \cdot 1.000000 \cdot 256}{8^2} \\ & \approx 1.723611497\end{aligned}$$
Modular invariants
For more coefficients, see the Downloads section to the right.
| Modular degree: | 24576 |
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| $ \Gamma_0(N) $-optimal: | no | |
| Manin constant: | 1 |
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Local data at primes of bad reduction
This elliptic curve is not semistable. There are 4 primes $p$ of bad reduction:
| $p$ | Tamagawa number | Kodaira symbol | Reduction type | Root number | $\mathrm{ord}_p(N)$ | $\mathrm{ord}_p(\Delta)$ | $\mathrm{ord}_p(\mathrm{den}(j))$ |
|---|---|---|---|---|---|---|---|
| $2$ | $4$ | $I_{6}^{*}$ | additive | -1 | 4 | 14 | 2 |
| $3$ | $2$ | $I_{2}$ | nonsplit multiplicative | 1 | 1 | 2 | 2 |
| $5$ | $4$ | $I_{4}$ | split multiplicative | -1 | 1 | 4 | 4 |
| $7$ | $8$ | $I_{8}$ | split multiplicative | -1 | 1 | 8 | 8 |
Galois representations
The $\ell$-adic Galois representation has maximal image for all primes $\ell$ except those listed in the table below.
| prime $\ell$ | mod-$\ell$ image | $\ell$-adic image |
|---|---|---|
| $2$ | 2Cs | 8.96.0.43 |
The image $H:=\rho_E(\Gal(\overline{\Q}/\Q))$ of the adelic Galois representation has level \( 1680 = 2^{4} \cdot 3 \cdot 5 \cdot 7 \), index $768$, genus $13$, and generators
$\left(\begin{array}{rr} 1353 & 16 \\ 1076 & 121 \end{array}\right),\left(\begin{array}{rr} 1 & 16 \\ 0 & 1 \end{array}\right),\left(\begin{array}{rr} 1 & 16 \\ 6 & 517 \end{array}\right),\left(\begin{array}{rr} 9 & 16 \\ 754 & 345 \end{array}\right),\left(\begin{array}{rr} 1665 & 16 \\ 1664 & 17 \end{array}\right),\left(\begin{array}{rr} 1 & 16 \\ 4 & 65 \end{array}\right),\left(\begin{array}{rr} 1 & 0 \\ 16 & 1 \end{array}\right),\left(\begin{array}{rr} 489 & 8 \\ 1156 & 1641 \end{array}\right),\left(\begin{array}{rr} 1679 & 1664 \\ 1674 & 113 \end{array}\right)$.
The torsion field $K:=\Q(E[1680])$ is a degree-$1486356480$ Galois extension of $\Q$ with $\Gal(K/\Q)$ isomorphic to the projection of $H$ to $\GL_2(\Z/1680\Z)$.
The table below list all primes $\ell$ for which the Serre invariants associated to the mod-$\ell$ Galois representation are exceptional.
| $\ell$ | Reduction type | Serre weight | Serre conductor |
|---|---|---|---|
| $2$ | additive | $2$ | \( 1 \) |
| $3$ | nonsplit multiplicative | $4$ | \( 560 = 2^{4} \cdot 5 \cdot 7 \) |
| $5$ | split multiplicative | $6$ | \( 336 = 2^{4} \cdot 3 \cdot 7 \) |
| $7$ | split multiplicative | $8$ | \( 240 = 2^{4} \cdot 3 \cdot 5 \) |
Isogenies
This curve has non-trivial cyclic isogenies of degree $d$ for $d=$
2, 4 and 8.
Its isogeny class 1680.j
consists of 8 curves linked by isogenies of
degrees dividing 16.
Twists
The minimal quadratic twist of this elliptic curve is 210.e2, its twist by $-4$.
Growth of torsion in number fields
The number fields $K$ of degree less than 24 such that $E(K)_{\rm tors}$ is strictly larger than $E(\Q)_{\rm tors}$ $\cong \Z/{2}\Z \oplus \Z/{4}\Z$ are as follows:
| $[K:\Q]$ | $K$ | $E(K)_{\rm tors}$ | Base change curve |
|---|---|---|---|
| $2$ | \(\Q(\sqrt{2}) \) | \(\Z/2\Z \oplus \Z/8\Z\) | not in database |
| $4$ | \(\Q(i, \sqrt{6})\) | \(\Z/4\Z \oplus \Z/4\Z\) | not in database |
| $4$ | \(\Q(\zeta_{12})\) | \(\Z/2\Z \oplus \Z/8\Z\) | not in database |
| $8$ | 8.0.7644119040000.32 | \(\Z/4\Z \oplus \Z/8\Z\) | not in database |
| $8$ | 8.0.7644119040000.31 | \(\Z/4\Z \oplus \Z/8\Z\) | not in database |
| $8$ | \(\Q(\zeta_{24})\) | \(\Z/4\Z \oplus \Z/8\Z\) | not in database |
| $8$ | 8.8.25176309760000.1 | \(\Z/2\Z \oplus \Z/16\Z\) | not in database |
| $8$ | 8.0.509820272640000.402 | \(\Z/2\Z \oplus \Z/16\Z\) | not in database |
| $8$ | 8.2.272211166080000.4 | \(\Z/2\Z \oplus \Z/12\Z\) | not in database |
| $16$ | deg 16 | \(\Z/8\Z \oplus \Z/8\Z\) | not in database |
| $16$ | deg 16 | \(\Z/2\Z \oplus \Z/16\Z\) | not in database |
| $16$ | deg 16 | \(\Z/2\Z \oplus \Z/24\Z\) | not in database |
We only show fields where the torsion growth is primitive. For fields not in the database, click on the degree shown to reveal the defining polynomial.
Iwasawa invariants
| $p$ | 2 | 3 | 5 | 7 |
|---|---|---|---|---|
| Reduction type | add | nonsplit | split | split |
| $\lambda$-invariant(s) | - | 0 | 1 | 1 |
| $\mu$-invariant(s) | - | 0 | 0 | 0 |
All Iwasawa $\lambda$ and $\mu$-invariants for primes $p\ge 3$ of good reduction are zero.
An entry - indicates that the invariants are not computed because the reduction is additive.
$p$-adic regulators
All $p$-adic regulators are identically $1$ since the rank is $0$.