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Properties

Base field \(\Q(\sqrt{13}) \)
Label 2.2.13.1-81.4-c
Number of curves 2
Graph
Conductor 81.4
Rank \( 1 \)

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Base field \(\Q(\sqrt{13}) \)

Copy content comment:Define the base number field
 
Copy content sage:R.<x> = PolynomialRing(QQ); K.<a> = NumberField(R([-3, -1, 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 \( x^{2} - x - 3 \); class number \(1\).

Copy content comment:Define the isogeny class
 
Copy content sage:E = EllipticCurve([K([0,0]),K([-1,1]),K([0,1]),K([-9,3]),K([19,-10])]) 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 81.4-c have rank \( 1 \).

Isogeny matrix

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

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

Isogeny graph

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

Elliptic curves in class 81.4-c over \(\Q(\sqrt{13}) \)

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

Isogeny class 81.4-c contains 2 curves linked by isogenies of degree 3.

Curve label Weierstrass Coefficients
81.4-c1 \( \bigl[0\) , \( a - 1\) , \( a\) , \( 3 a - 9\) , \( -10 a + 19\bigr] \)
81.4-c2 \( \bigl[0\) , \( a - 1\) , \( a\) , \( 2 a - 5\) , \( -a + 1\bigr] \)