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SageMath
E = EllipticCurve("a1")
E.isogeny_class()
Elliptic curves in class 1989.a
sage: E.isogeny_class().curves
LMFDB label | Cremona label | Weierstrass coefficients | j-invariant | Discriminant | Torsion structure | Modular degree | Faltings height | Optimality |
---|---|---|---|---|---|---|---|---|
1989.a1 | 1989c1 | \([1, -1, 1, -536, -4638]\) | \(23320116793/2873\) | \(2094417\) | \([2]\) | \(576\) | \(0.23629\) | \(\Gamma_0(N)\)-optimal |
1989.a2 | 1989c2 | \([1, -1, 1, -491, -5484]\) | \(-17923019113/8254129\) | \(-6017260041\) | \([2]\) | \(1152\) | \(0.58286\) |
Rank
sage: E.rank()
The elliptic curves in class 1989.a have rank \(0\).
Complex multiplication
The elliptic curves in class 1989.a do not have complex multiplication.Modular form 1989.2.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 LMFDB numbering.
\(\left(\begin{array}{rr} 1 & 2 \\ 2 & 1 \end{array}\right)\)
Isogeny graph
sage: E.isogeny_graph().plot(edge_labels=True)
The vertices are labelled with LMFDB labels.