Properties

Label 2.79.i_ck
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:  $1 + 8 x + 62 x^{2} + 632 x^{3} + 6241 x^{4}$
Frobenius angles:  $\pm0.379247013762$, $\pm0.806225893447$
Angle rank:  $2$ (numerical)
Number field:  4.0.1380624.1
Galois group:  $D_{4}$
Jacobians:  $528$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6944$ $39330816$ $243541585952$ $1517452732809216$ $9467612957806382624$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $88$ $6302$ $493960$ $38958910$ $3076840888$ $243087676382$ $19203909260008$ $1517108875130494$ $119851596649275160$ $9468276071698249502$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 528 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 4.0.1380624.1.

Base change

This is a primitive isogeny class.

Twists

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

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