Properties

Label 2.71.ad_ec
Base field $\F_{71}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple yes
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{71}$
Dimension:  $2$
L-polynomial:  $1 - 3 x + 106 x^{2} - 213 x^{3} + 5041 x^{4}$
Frobenius angles:  $\pm0.349281488470$, $\pm0.589666003736$
Angle rank:  $2$ (numerical)
Number field:  4.0.4258993.1
Galois group:  $D_{4}$
Jacobians:  $260$

This isogeny class is simple and geometrically simple, primitive, ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

This isogeny class is ordinary.

$p$-rank:  $2$
Slopes:  $[0, 0, 1, 1]$

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4932$ $26455248$ $128203019568$ $645724878412608$ $3255287657634420732$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $69$ $5245$ $358200$ $25410553$ $1804253799$ $128099514958$ $9095113567833$ $645753603882769$ $45848501347932648$ $3255243547671367765$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 260 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{71}$.

Endomorphism algebra over $\F_{71}$
The endomorphism algebra of this simple isogeny class is 4.0.4258993.1.

Base change

This is a primitive isogeny class.

Twists

Below is a list of all twists of this isogeny class.

TwistExtension degreeCommon base change
2.71.d_ec$2$(not in LMFDB)