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Properties

Base field \(\Q(\sqrt{-31}) \)
Label 2.0.31.1-400.8-a
Number of curves 4
Graph
Conductor 400.8
Rank \( 1 \)

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Base field \(\Q(\sqrt{-31}) \)

Copy content comment:Define the base number field
 
Copy content sage:R.<x> = PolynomialRing(QQ); K.<a> = NumberField(R([8, -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 \( x^{2} - x + 8 \); class number \(3\).

Copy content comment:Define the isogeny class
 
Copy content sage:E = EllipticCurve([K([0,0]),K([1,0]),K([0,0]),K([-36,0]),K([-140,0])]) 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 400.8-a have rank \( 1 \).

Isogeny matrix

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

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

Elliptic curves in class 400.8-a over \(\Q(\sqrt{-31}) \)

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

Isogeny class 400.8-a contains 4 curves linked by isogenies of degrees dividing 6.

Curve label Weierstrass Coefficients
400.8-a1 \( \bigl[0\) , \( 1\) , \( 0\) , \( -36\) , \( -140\bigr] \)
400.8-a2 \( \bigl[0\) , \( 1\) , \( 0\) , \( 4\) , \( 4\bigr] \)
400.8-a3 \( \bigl[0\) , \( 1\) , \( 0\) , \( -1\) , \( 0\bigr] \)
400.8-a4 \( \bigl[0\) , \( 1\) , \( 0\) , \( -41\) , \( -116\bigr] \)