Properties

Label 108.a
Number of curves $2$
Conductor $108$
CM \(\Q(\sqrt{-3}) \)
Rank $0$
Graph

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Show commands: SageMath
sage: E = EllipticCurve("a1")
 
sage: E.isogeny_class()
 

Elliptic curves in class 108.a

sage: E.isogeny_class().curves
 
LMFDB label Cremona label Weierstrass coefficients j-invariant Discriminant Torsion structure Modular degree Faltings height Optimality CM discriminant
108.a1 108a2 \([0, 0, 0, 0, -108]\) \(0\) \(-5038848\) \([]\) \(18\) \(-0.035060\)   \(-3\)
108.a2 108a1 \([0, 0, 0, 0, 4]\) \(0\) \(-6912\) \([3]\) \(6\) \(-0.58437\) \(\Gamma_0(N)\)-optimal \(-3\)

Rank

sage: E.rank()
 

The elliptic curves in class 108.a have rank \(0\).

Complex multiplication

Each elliptic curve in class 108.a 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)
 
\(q + 5q^{7} - 7q^{13} - q^{19} + O(q^{20})\)  Toggle raw display

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.

\(\left(\begin{array}{rr} 1 & 3 \\ 3 & 1 \end{array}\right)\)

Isogeny graph

sage: E.isogeny_graph().plot(edge_labels=True)
 

The vertices are labelled with LMFDB labels.