Properties

Label 2.67.i_eo
Base field $\F_{67}$
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:  $\F_{67}$
Dimension:  $2$
L-polynomial:  $1 + 8 x + 118 x^{2} + 536 x^{3} + 4489 x^{4}$
Frobenius angles:  $\pm0.467729086357$, $\pm0.700827428926$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-55 +8 \sqrt{2}})\)
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5152$ $20937728$ $90244497952$ $406048876642304$ $1822788349503130912$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $76$ $4662$ $300052$ $20150190$ $1350088476$ $90458394726$ $6060719523172$ $406067636550750$ $27206533947747052$ $1822837808678509462$

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 $\F_{67}$.

Endomorphism algebra over $\F_{67}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-55 +8 \sqrt{2}})\).

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.67.ai_eo$2$(not in LMFDB)