Base field \(\Q(\sqrt{-14}) \)
Generator \(a\), with minimal polynomial \( x^{2} + 14 \); class number \(4\).
Weierstrass equation
This is not a global minimal model: it is minimal at all primes except \((2,a)\). No global minimal model exists.
Mordell-Weil group structure
\(\Z\)
Mordell-Weil generators
| $P$ | $\hat{h}(P)$ | Order |
|---|---|---|
| $\left(7 : -4 a + 8 : 1\right)$ | $0.99264960701324094493119303350340755273$ | $\infty$ |
Invariants
| Conductor: | $\frak{N}$ | = | \((26,13a)\) | = | \((2,a)\cdot(13,a+5)\cdot(13,a+8)\) |
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| Conductor norm: | $N(\frak{N})$ | = | \( 338 \) | = | \(2\cdot13\cdot13\) |
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| Discriminant: | $\Delta$ | = | $1124864$ | ||
| Discriminant ideal: | $(\Delta)$ | = | \((1124864)\) | = | \((2,a)^{18}\cdot(13,a+5)^{3}\cdot(13,a+8)^{3}\) |
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| Discriminant norm: | $N(\Delta)$ | = | \( 1265319018496 \) | = | \(2^{18}\cdot13^{3}\cdot13^{3}\) |
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| Minimal discriminant: | $\frak{D}_{\mathrm{min}}$ | = | \((17576)\) | = | \((2,a)^{6}\cdot(13,a+5)^{3}\cdot(13,a+8)^{3}\) |
| Minimal discriminant norm: | $N(\frak{D}_{\mathrm{min}})$ | = | \( 308915776 \) | = | \(2^{6}\cdot13^{3}\cdot13^{3}\) |
| j-invariant: | $j$ | = | \( -\frac{10218313}{17576} \) | ||
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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: | $\mathrm{ST}(E)$ | = | $\mathrm{SU}(2)$ | ||
BSD invariants
| Analytic rank: | $r_{\mathrm{an}}$ | = | \( 1 \) |
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| Mordell-Weil rank: | $r$ | = | \(1\) |
| Regulator: | $\mathrm{Reg}(E/K)$ | ≈ | \( 0.99264960701324094493119303350340755273 \) |
| Néron-Tate Regulator: | $\mathrm{Reg}_{\mathrm{NT}}(E/K)$ | ≈ | \( 1.98529921402648188986238606700681510546 \) |
| Global period: | $\Omega(E/K)$ | ≈ | \( 5.3816047854932887016509055069197731496 \) |
| Tamagawa product: | $\prod_{\frak{p}}c_{\frak{p}}$ | = | \( 2 \) = \(2\cdot1\cdot1\) |
| Torsion order: | $\#E(K)_{\mathrm{tor}}$ | = | \(1\) |
| Special value: | $L^{(r)}(E/K,1)/r!$ | ≈ | \( 2.8554446990810165268323725380214950126 \) |
| Analytic order of Ш: | Ш${}_{\mathrm{an}}$ | = | \( 1 \) (rounded) |
BSD formula
$$\begin{aligned}2.855444699 \approx L'(E/K,1) & \overset{?}{=} \frac{ \# ะจ(E/K) \cdot \Omega(E/K) \cdot \mathrm{Reg}_{\mathrm{NT}}(E/K) \cdot \prod_{\mathfrak{p}} c_{\mathfrak{p}} } { \#E(K)_{\mathrm{tor}}^2 \cdot \left|d_K\right|^{1/2} } \\ & \approx \frac{ 1 \cdot 5.381605 \cdot 1.985299 \cdot 2 } { {1^2 \cdot 7.483315} } \\ & \approx 2.855444699 \end{aligned}$$
Local data at primes of bad reduction
This elliptic curve is semistable. There are 3 primes $\frak{p}$ of bad reduction. Primes of good reduction for the curve but which divide the discriminant of the model above (if any) are included.
| $\mathfrak{p}$ | $N(\mathfrak{p})$ | Tamagawa number | Kodaira symbol | Reduction type | Root number | \(\mathrm{ord}_{\mathfrak{p}}(\mathfrak{N}\)) | \(\mathrm{ord}_{\mathfrak{p}}(\mathfrak{D}_{\mathrm{min}}\)) | \(\mathrm{ord}_{\mathfrak{p}}(\mathrm{den}(j))\) |
|---|---|---|---|---|---|---|---|---|
| \((2,a)\) | \(2\) | \(2\) | \(I_{6}\) | Non-split multiplicative | \(1\) | \(1\) | \(6\) | \(6\) |
| \((13,a+5)\) | \(13\) | \(1\) | \(I_{3}\) | Non-split multiplicative | \(1\) | \(1\) | \(3\) | \(3\) |
| \((13,a+8)\) | \(13\) | \(1\) | \(I_{3}\) | Non-split multiplicative | \(1\) | \(1\) | \(3\) | \(3\) |
Galois Representations
The mod \( p \) Galois Representation has maximal image for all primes \( p < 1000 \) except those listed.
| prime | Image of Galois Representation |
|---|---|
| \(3\) | 3Cs |
Isogenies and isogeny class
This curve has non-trivial cyclic isogenies of degree \(d\) for \(d=\)
3.
Its isogeny class
338.2-a
consists of curves linked by isogenies of
degrees dividing 9.
Base change
This elliptic curve is a \(\Q\)-curve. It is the base change of the following 2 elliptic curves:
| Base field | Curve |
|---|---|
| \(\Q\) | 832.d2 |
| \(\Q\) | 1274.d2 |