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Properties

Base field \(\Q(\sqrt{-5}) \)
Label 2.0.20.1-900.2-a
Number of curves 4
Graph
Conductor 900.2
Rank \( 2 \)

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

Copy content comment:Define the base number field
 
Copy content sage:R.<x> = PolynomialRing(QQ); K.<a> = NumberField(R([5, 0, 1]))
 
Copy content pari:K = nfinit(Polrev(%s));
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R!%s);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(Qx(%s))
 

Generator \(a\), with minimal polynomial \( x^{2} + 5 \); class number \(2\).

Copy content comment:Define the isogeny class
 
Copy content sage:E = EllipticCurve([K([0,0]),K([-1,0]),K([0,0]),K([12,0]),K([72,0])]) E.isogeny_class()
 

Rank

Copy content comment:Compute the Mordell-Weil rank
 
Copy content sage:E.rank()
 
Copy content magma:Rank(E);
 

The elliptic curves in class 900.2-a have rank \( 2 \).

Isogeny matrix

Copy content comment:Isogeny matrix
 
Copy content sage:E.isogeny_class().matrix()
 

\(\left(\begin{array}{rrrr} 1 & 2 & 2 & 2 \\ 2 & 1 & 4 & 4 \\ 2 & 4 & 1 & 4 \\ 2 & 4 & 4 & 1 \end{array}\right)\)

Isogeny graph

Copy content comment:Isogeny graph
 
Copy content sage:E.isogeny_class().graph().plot(edge_labels=True)
 

Elliptic curves in class 900.2-a over \(\Q(\sqrt{-5}) \)

Copy content comment:List of curves in the isogeny class
 
Copy content sage:E.isogeny_class().curves
 

Isogeny class 900.2-a contains 4 curves linked by isogenies of degrees dividing 4.

Curve label Weierstrass Coefficients
900.2-a1 \( \bigl[0\) , \( -1\) , \( 0\) , \( 12\) , \( 72\bigr] \)
900.2-a2 \( \bigl[0\) , \( -1\) , \( 0\) , \( -13\) , \( 22\bigr] \)
900.2-a3 \( \bigl[0\) , \( -1\) , \( 0\) , \( 100 a + 212\) , \( -360 a + 1872\bigr] \)
900.2-a4 \( \bigl[0\) , \( -1\) , \( 0\) , \( -100 a + 212\) , \( 360 a + 1872\bigr] \)