Minimal Weierstrass equation
Minimal Weierstrass equation
Simplified equation
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\(y^2+xy+y=x^3-x^2-1300122848x-18041242862294\)
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(homogenize, simplify) |
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\(y^2z+xyz+yz^2=x^3-x^2z-1300122848xz^2-18041242862294z^3\)
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(dehomogenize, simplify) |
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\(y^2=x^3-20801965563x-1154660345152362\)
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(homogenize, minimize) |
Mordell-Weil group structure
\(\Z/{2}\Z\)
Mordell-Weil generators
| $P$ | $\hat{h}(P)$ | Order |
|---|---|---|
| \( \left(41635, -20818\right) \) | $0$ | $2$ |
| $P$ | $\hat{h}(P)$ | Order |
|---|---|---|
| \([41635:-20818:1]\) | $0$ | $2$ |
| $P$ | $\hat{h}(P)$ | Order |
|---|---|---|
| \( \left(166539, 0\right) \) | $0$ | $2$ |
Integral points
\( \left(41635, -20818\right) \)
\([41635:-20818:1]\)
\( \left(166539, 0\right) \)
Invariants
| Conductor: | $N$ | = | \( 83205 \) | = | $3^{2} \cdot 5 \cdot 43^{2}$ |
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| Minimal Discriminant: | $\Delta$ | = | $32655064223749273681640625$ | = | $3^{9} \cdot 5^{14} \cdot 43^{7} $ |
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| j-invariant: | $j$ | = | \( \frac{1953326569433829507}{262451171875} \) | = | $3^{3} \cdot 5^{-14} \cdot 43^{-1} \cdot 269^{3} \cdot 1549^{3}$ |
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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: | $h_{\mathrm{Faltings}}$ | ≈ | $3.9145640617164837852237102412$ |
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| Stable Faltings height: | $h_{\mathrm{stable}}$ | ≈ | $1.2100047873686203049408550568$ |
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| $abc$ quality: | $Q$ | ≈ | $1.0105787079571165$ | |||
| Szpiro ratio: | $\sigma_{m}$ | ≈ | $6.582254741954171$ | |||
| Intrinsic torsion order: | $\#E(\mathbb Q)_\text{tors}^\text{is}$ | = | $1$ | |||
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: | $\Omega$ | ≈ | $0.025142413144104176345521779590$ |
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| Tamagawa product: | $\prod_{p}c_p$ | = | $ 16 $ = $ 2\cdot2\cdot2^{2} $ |
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| Torsion order: | $\#E(\Q)_{\mathrm{tor}}$ | = | $2$ |
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| Special value: | $ L(E,1)$ | ≈ | $0.90512687318775034843878406523 $ |
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| Analytic order of Ш: | Ш${}_{\mathrm{an}}$ | = | $9$ = $3^2$ (exact) |
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BSD formula
$$\begin{aligned} 0.905126873 \approx L(E,1) & = \frac{\# ะจ(E/\Q)\cdot \Omega_E \cdot \mathrm{Reg}(E/\Q) \cdot \prod_p c_p}{\#E(\Q)_{\rm tor}^2} \\ & \approx \frac{9 \cdot 0.025142 \cdot 1.000000 \cdot 16}{2^2} \\ & \approx 0.905126873\end{aligned}$$
Modular invariants
Modular form 83205.2.a.d
For more coefficients, see the Downloads section to the right.
| Modular degree: | 49674240 |
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| $ \Gamma_0(N) $-optimal: | yes | |
| Manin constant: | 1 |
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Local data at primes of bad reduction
This elliptic curve is not semistable. There are 3 primes $p$ of bad reduction:
| $p$ | Tamagawa number | Kodaira symbol | Reduction type | Root number | $\mathrm{ord}_p(N)$ | $\mathrm{ord}_p(\Delta)$ | $\mathrm{ord}_p(\mathrm{den}(j))$ |
|---|---|---|---|---|---|---|---|
| $3$ | $2$ | $III^{*}$ | additive | 1 | 2 | 9 | 0 |
| $5$ | $2$ | $I_{14}$ | nonsplit multiplicative | 1 | 1 | 14 | 14 |
| $43$ | $4$ | $I_{1}^{*}$ | additive | -1 | 2 | 7 | 1 |
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 | $\ell$-adic index |
|---|---|---|---|
| $2$ | 2B | 2.3.0.1 | $3$ |
The image $H:=\rho_E(\Gal(\overline{\Q}/\Q))$ of the adelic Galois representation has level \( 2580 = 2^{2} \cdot 3 \cdot 5 \cdot 43 \), index $12$, genus $0$, and generators
$\left(\begin{array}{rr} 1 & 0 \\ 4 & 1 \end{array}\right),\left(\begin{array}{rr} 3 & 4 \\ 8 & 11 \end{array}\right),\left(\begin{array}{rr} 1724 & 1 \\ 859 & 0 \end{array}\right),\left(\begin{array}{rr} 1 & 2 \\ 2 & 5 \end{array}\right),\left(\begin{array}{rr} 1382 & 1 \\ 599 & 0 \end{array}\right),\left(\begin{array}{rr} 1 & 4 \\ 0 & 1 \end{array}\right),\left(\begin{array}{rr} 649 & 1936 \\ 644 & 1935 \end{array}\right),\left(\begin{array}{rr} 2577 & 4 \\ 2576 & 5 \end{array}\right),\left(\begin{array}{rr} 517 & 4 \\ 1034 & 9 \end{array}\right)$.
The torsion field $K:=\Q(E[2580])$ is a degree-$615165788160$ Galois extension of $\Q$ with $\Gal(K/\Q)$ isomorphic to the projection of $H$ to $\GL_2(\Z/2580\Z)$.
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 |
|---|---|---|---|
| $2$ | good | $2$ | \( 5547 = 3 \cdot 43^{2} \) |
| $3$ | additive | $2$ | \( 9245 = 5 \cdot 43^{2} \) |
| $5$ | nonsplit multiplicative | $6$ | \( 16641 = 3^{2} \cdot 43^{2} \) |
| $7$ | good | $2$ | \( 16641 = 3^{2} \cdot 43^{2} \) |
| $43$ | additive | $968$ | \( 45 = 3^{2} \cdot 5 \) |
Isogenies
This curve has non-trivial cyclic isogenies of degree $d$ for $d=$
2.
Its isogeny class 83205.d
consists of 2 curves linked by isogenies of
degree 2.
Twists
The minimal quadratic twist of this elliptic curve is 1935.c2, its twist by $129$.
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 $E(\Q)_{\rm tors}$ $\cong \Z/{2}\Z$ are as follows:
| $[K:\Q]$ | $K$ | $E(K)_{\rm tors}$ | Base change curve |
|---|---|---|---|
| $2$ | \(\Q(\sqrt{129}) \) | \(\Z/2\Z \oplus \Z/2\Z\) | not in database |
| $4$ | \(\Q(\sqrt{33 +8 \sqrt{15}})\) | \(\Z/4\Z\) | not in database |
| $8$ | 8.8.398768948640000.1 | \(\Z/2\Z \oplus \Z/4\Z\) | not in database |
| $8$ | deg 8 | \(\Z/2\Z \oplus \Z/4\Z\) | not in database |
| $8$ | deg 8 | \(\Z/6\Z\) | not in database |
| $16$ | deg 16 | \(\Z/8\Z\) | not in database |
| $16$ | deg 16 | \(\Z/2\Z \oplus \Z/6\Z\) | 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 | 43 |
|---|---|---|---|---|
| Reduction type | ord | add | nonsplit | add |
| $\lambda$-invariant(s) | 7 | - | 0 | - |
| $\mu$-invariant(s) | 0 | - | 0 | - |
All Iwasawa $\lambda$ and $\mu$-invariants for primes $p\ge 5$ 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 $0$.