This is a model for the modular curve $X_0(24)$.
Minimal Weierstrass equation
\(y^2=x^3-x^2-4x+4\) 
Mordell-Weil group structure
$\Z/{2}\Z \times \Z/{4}\Z$
Torsion generators
\( \left(1, 0\right) \), \( \left(4, 6\right) \)
Integral points
\( \left(-2, 0\right) \), \((0,\pm 2)\), \( \left(1, 0\right) \), \( \left(2, 0\right) \), \((4,\pm 6)\)
Invariants
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sage: E.conductor().factor()
gp: ellglobalred(E)[1]
magma: Conductor(E);
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| Conductor: | \( 24 \) | = | $2^{3} \cdot 3$ |
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sage: E.discriminant().factor()
gp: E.disc
magma: Discriminant(E);
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| Discriminant: | $2304 $ | = | $2^{8} \cdot 3^{2} $ |
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sage: E.j_invariant().factor()
gp: E.j
magma: jInvariant(E);
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| j-invariant: | \( \frac{35152}{9} \) | = | $2^{4} \cdot 3^{-2} \cdot 13^{3}$ |
| Endomorphism ring: | $\Z$ | ||
| Geometric endomorphism ring: | \(\Z\) | (no potential complex multiplication) | |
| Sato-Tate group: | $\mathrm{SU}(2)$ | ||
| Faltings height: | $-0.64535228607985727265901067683\dots$ | ||
| Stable Faltings height: | $-1.1074504064531541456038320911\dots$ | ||
BSD invariants
sage: E.rank()
magma: Rank(E);
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| Analytic rank: | $0$ | ||
sage: E.regulator()
magma: Regulator(E);
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| Regulator: | $1$ | ||
sage: E.period_lattice().omega()
gp: E.omega[1]
magma: RealPeriod(E);
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| Real period: | $4.3130312949992864708773499976\dots$ | ||
sage: E.tamagawa_numbers()
gp: gr=ellglobalred(E); [[gr[4][i,1],gr[5][i][4]] | i<-[1..#gr[4][,1]]]
magma: TamagawaNumbers(E);
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| Tamagawa product: | $ 8 $ = $ 2^{2}\cdot2 $ | ||
sage: E.torsion_order()
gp: elltors(E)[1]
magma: Order(TorsionSubgroup(E));
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| Torsion order: | $8$ | ||
sage: E.sha().an_numerical()
magma: MordellWeilShaInformation(E);
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| Analytic order of Ш: | $1$ (exact) | ||
sage: r = E.rank();
gp: ar = ellanalyticrank(E);
magma: Lr1 where r,Lr1 := AnalyticRank(E: Precision:=12);
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| Special value: | $ L(E,1) $ ≈ $ 0.53912891187491080885966874970005048289 $ | ||
Modular invariants
For more coefficients, see the Downloads section to the right.
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sage: E.modular_degree()
magma: ModularDegree(E);
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| Modular degree: | 1 | ||
| $ \Gamma_0(N) $-optimal: | yes | ||
| Manin constant: | 1 | ||
Local data
This elliptic curve is not semistable. There are 2 primes of bad reduction:
| prime | Tamagawa number | Kodaira symbol | Reduction type | Root number | ord($N$) | ord($\Delta$) | ord$(j)_{-}$ |
|---|---|---|---|---|---|---|---|
| $2$ | $4$ | $I_{1}^{*}$ | Additive | -1 | 3 | 8 | 0 |
| $3$ | $2$ | $I_{2}$ | Non-split multiplicative | 1 | 1 | 2 | 2 |
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 | 8.96.0.42 |
$p$-adic regulators
All $p$-adic regulators are identically $1$ since the rank is $0$.
Iwasawa invariants
| $p$ | 2 | 3 |
|---|---|---|
| Reduction type | add | nonsplit |
| $\lambda$-invariant(s) | - | 0 |
| $\mu$-invariant(s) | - | 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.
Isogenies
This curve has non-trivial cyclic isogenies of degree $d$ for $d=$
2 and 4.
Its isogeny class 24.a
consists of 6 curves linked by isogenies of
degrees dividing 8.
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 $E(\Q)_{\rm tors}$ $\cong \Z/{2}\Z \times \Z/{4}\Z$ are as follows:
| $[K:\Q]$ | $K$ | $E(K)_{\rm tors}$ | Base change curve |
|---|---|---|---|
| $4$ | \(\Q(\zeta_{12})\) | \(\Z/4\Z \times \Z/4\Z\) | Not in database |
| $4$ | \(\Q(\sqrt{2}, \sqrt{3})\) | \(\Z/2\Z \times \Z/8\Z\) | 4.4.2304.1-72.1-b4 |
| $4$ | \(\Q(\zeta_{8})\) | \(\Z/2\Z \times \Z/8\Z\) | Not in database |
| $8$ | \(\Q(\zeta_{24})\) | \(\Z/4\Z \times \Z/8\Z\) | Not in database |
| $8$ | 8.0.2985984.1 | \(\Z/4\Z \times \Z/8\Z\) | Not in database |
| $8$ | 8.2.181398528.1 | \(\Z/2\Z \times \Z/12\Z\) | Not in database |
| $16$ | 16.0.36520347436056576.1 | \(\Z/8\Z \times \Z/8\Z\) | Not in database |
| $16$ | 16.8.2393397489569403764736.2 | \(\Z/2\Z \times \Z/16\Z\) | Not in database |
| $16$ | 16.0.364791569817010176.2 | \(\Z/2\Z \times \Z/16\Z\) | Not in database |
We only show fields where the torsion growth is primitive.
Additional information
This curve is also a quotient of the genus-3 hyperelliptic curve $$y^2 = x^8 + 14x^4 + 1$$ which has geometric automorphism group $S_4 \times \Z/2\Z$.