Properties

Label 2.83.ap_fs
Base field $\F_{83}$
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:  $\F_{83}$
Dimension:  $2$
L-polynomial:  $1 - 15 x + 148 x^{2} - 1245 x^{3} + 6889 x^{4}$
Frobenius angles:  $\pm0.154481465665$, $\pm0.519522970985$
Angle rank:  $2$ (numerical)
Number field:  4.0.26022744.1
Galois group:  $D_{4}$
Jacobians:  $176$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5778$ $47945844$ $326684260296$ $2251894702019616$ $15516563810892968718$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $69$ $6961$ $571338$ $47449945$ $3939173319$ $326942553922$ $27136056732693$ $2252292218452849$ $186940256013063054$ $15516041192542542961$

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 $\F_{83}$.

Endomorphism algebra over $\F_{83}$
The endomorphism algebra of this simple isogeny class is 4.0.26022744.1.

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.83.p_fs$2$(not in LMFDB)