Properties

Label 2.79.ai_ez
Base field $\F_{79}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple yes
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

Related objects

Downloads

Learn more

Invariants

Base field:  $\F_{79}$
Dimension:  $2$
L-polynomial:  $1 - 8 x + 129 x^{2} - 632 x^{3} + 6241 x^{4}$
Frobenius angles:  $\pm0.294217793764$, $\pm0.548683571503$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-255 +24 \sqrt{5}})\)
Galois group:  $D_{4}$
Jacobians:  $320$
Cyclic group of points:    yes

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5731$ $40180041$ $243426838336$ $1517123814183945$ $9468543399597448771$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $72$ $6436$ $493728$ $38950468$ $3077143272$ $243087324766$ $19203892683768$ $1517108748849028$ $119851596972360672$ $9468276088934144356$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 320 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{79}$.

Endomorphism algebra over $\F_{79}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-255 +24 \sqrt{5}})\).

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.79.i_ez$2$(not in LMFDB)