Elliptic curve isogeny class 71.2-a over number field \(\Q(\sqrt{5}) \)

• Base field: \(\Q(\sqrt{5}) \)
• Label: 2.2.5.1-71.2-a
• Conductor: 71.2
• Rank: \( 0 \)

Base field \(\Q(\sqrt{5}) \)

Generator \(\phi\), with minimal polynomial \( x^{2} - x - 1 \); class number \(1\).

Elliptic curves in class 71.2-a over \(\Q(\sqrt{5}) \)

Isogeny class 71.2-a contains 4 curves linked by isogenies of degrees dividing 6.

Curve label	Weierstrass Coefficients
71.2-a1	\( \bigl[\phi + 1\) , \( \phi - 1\) , \( 1\) , \( 0\) , \( 0\bigr] \)
71.2-a2	\( \bigl[1\) , \( 1\) , \( \phi + 1\) , \( 13 \phi + 4\) , \( -6 \phi - 9\bigr] \)
71.2-a3	\( \bigl[\phi + 1\) , \( \phi - 1\) , \( 1\) , \( 5 \phi - 25\) , \( 12 \phi - 46\bigr] \)
71.2-a4	\( \bigl[\phi + 1\) , \( \phi - 1\) , \( 1\) , \( -5 \phi\) , \( 2 \phi\bigr] \)

Rank

Rank: \( 0 \)

Isogeny matrix

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

Isogeny graph