Properties

Label 2.71.c_ak
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:  $1 + 2 x - 10 x^{2} + 142 x^{3} + 5041 x^{4}$
Frobenius angles:  $\pm0.264296801043$, $\pm0.791650804175$
Angle rank:  $2$ (numerical)
Number field:  4.0.1176808.2
Galois group:  $D_{4}$
Jacobians:  $360$
Cyclic group of points:    no
Non-cyclic primes:   $2$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5176$ $25300288$ $128277372184$ $646227647383552$ $3255173117307293656$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $74$ $5018$ $358406$ $25430334$ $1804190314$ $128100599354$ $9095113998310$ $645753458238910$ $45848500954861130$ $3255243549091627418$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 360 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 4.0.1176808.2.

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.ac_ak$2$(not in LMFDB)