Elliptic curve isogeny class with Cremona label 20a (LMFDB label 20.a)

• Label: 20a
• Number of curves: $4$
• Conductor: $20$
• CM: no
• Rank: $0$

Elliptic curves in class 20a

LMFDB label	Cremona label	Weierstrass coefficients	j-invariant	Discriminant	Torsion structure	Modular degree	Faltings height	Optimality
20.a4	20a1	\([0, 1, 0, 4, 4]\)	\(21296/25\)	\(-6400\)	\([6]\)	\(1\)	\(-0.58338\)	\(\Gamma_0(N)\)-optimal
20.a3	20a2	\([0, 1, 0, -1, 0]\)	\(16384/5\)	\(80\)	\([6]\)	\(2\)	\(-0.92995\)
20.a2	20a3	\([0, 1, 0, -36, -140]\)	\(-20720464/15625\)	\(-4000000\)	\([2]\)	\(3\)	\(-0.034070\)
20.a1	20a4	\([0, 1, 0, -41, -116]\)	\(488095744/125\)	\(2000\)	\([2]\)	\(6\)	\(-0.38064\)

Rank

The elliptic curves in class 20a have rank \(0\).

Complex multiplication

The elliptic curves in class 20a do not have complex multiplication.

Modular form 20.2.a.a

Isogeny 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.

\(\left(\begin{array}{rrrr} 1 & 2 & 3 & 6 \\ 2 & 1 & 6 & 3 \\ 3 & 6 & 1 & 2 \\ 6 & 3 & 2 & 1 \end{array}\right)\)

Isogeny graph

The vertices are labelled with Cremona labels.