Properties

Label 2.79.ae_a
Base field $\F_{79}$
Dimension $2$
$p$-rank $1$
Ordinary no
Supersingular no
Simple yes
Geometrically simple yes
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{79}$
Dimension:  $2$
L-polynomial:  $1 - 4 x - 316 x^{3} + 6241 x^{4}$
Frobenius angles:  $\pm0.189188793212$, $\pm0.706224779239$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-150 +36 \sqrt{2}})\)
Galois group:  $D_{4}$
Jacobians:  $312$
Cyclic group of points:    no
Non-cyclic primes:   $3$

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

Newton polygon

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

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5922$ $38860164$ $242589098178$ $1517874430704912$ $9468579226884982722$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $76$ $6226$ $492028$ $38969734$ $3077154916$ $243087629650$ $19203922208596$ $1517108771279230$ $119851595268295084$ $9468276082861111186$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 312 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 \(\Q(\sqrt{-150 +36 \sqrt{2}})\).

Base change

This is a primitive isogeny class.

Twists

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

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