Properties

Label 2.83.e_cs
Base field $\F_{83}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple no
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

Related objects

Downloads

Learn more

Invariants

Base field:  $\F_{83}$
Dimension:  $2$
L-polynomial:  $( 1 - 8 x + 83 x^{2} )( 1 + 12 x + 83 x^{2} )$
  $1 + 4 x + 70 x^{2} + 332 x^{3} + 6889 x^{4}$
Frobenius angles:  $\pm0.355312599736$, $\pm0.728844936469$
Angle rank:  $2$ (numerical)
Jacobians:  $570$
Cyclic group of points:    no
Non-cyclic primes:   $2$

This isogeny class is not 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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $7296$ $48328704$ $327065445504$ $2253083407220736$ $15515447208777638016$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $88$ $7014$ $572008$ $47474990$ $3938889848$ $326938882518$ $27136060459400$ $2252292233858014$ $186940256131576984$ $15516041190755894214$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 570 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{83}$.

Endomorphism algebra over $\F_{83}$
The isogeny class factors as 1.83.ai $\times$ 1.83.m and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

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.au_kc$2$(not in LMFDB)
2.83.ae_cs$2$(not in LMFDB)
2.83.u_kc$2$(not in LMFDB)