Properties

Label 2.43.b_ag
Base field $\F_{43}$
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:  $\F_{43}$
Dimension:  $2$
L-polynomial:  $1 + x - 6 x^{2} + 43 x^{3} + 1849 x^{4}$
Frobenius angles:  $\pm0.255746902027$, $\pm0.779980959098$
Angle rank:  $2$ (numerical)
Number field:  4.0.2617317.1
Galois group:  $D_{4}$
Jacobians:  $176$
Isomorphism classes:  220

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $1888$ $3398400$ $6333175168$ $11712585600000$ $21610375422569248$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $45$ $1837$ $79656$ $3425929$ $147000915$ $6321431014$ $271817917857$ $11688188524561$ $502592630529048$ $21611482128318157$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 176 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{43}$.

Endomorphism algebra over $\F_{43}$
The endomorphism algebra of this simple isogeny class is 4.0.2617317.1.

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.43.ab_ag$2$(not in LMFDB)