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SageMath
E = EllipticCurve("a1")
E.isogeny_class()
Elliptic curves in class 108a
sage: E.isogeny_class().curves
| LMFDB label | Cremona label | Weierstrass coefficients | j-invariant | Discriminant | Torsion structure | Modular degree | Faltings height | Optimality | CM discriminant |
|---|---|---|---|---|---|---|---|---|---|
| 108.a2 | 108a1 | \([0, 0, 0, 0, 4]\) | \(0\) | \(-6912\) | \([3]\) | \(6\) | \(-0.58437\) | \(\Gamma_0(N)\)-optimal | \(-3\) |
| 108.a1 | 108a2 | \([0, 0, 0, 0, -108]\) | \(0\) | \(-5038848\) | \([]\) | \(18\) | \(-0.035060\) | \(-3\) |
Rank
sage: E.rank()
The elliptic curves in class 108a have rank \(0\).
Complex multiplication
Each elliptic curve in class 108a has complex multiplication by an order in the imaginary quadratic field \(\Q(\sqrt{-3}) \).Modular form 108.2.a.a
sage: E.q_eigenform(10)
Isogeny matrix
sage: E.isogeny_class().matrix()
The \(i,j\) entry is the smallest degree of a cyclic isogeny between the \(i\)-th and \(j\)-th curve in the isogeny class, in the Cremona numbering.
\(\left(\begin{array}{rr} 1 & 3 \\ 3 & 1 \end{array}\right)\)
Isogeny graph
sage: E.isogeny_graph().plot(edge_labels=True)
The vertices are labelled with Cremona labels.
