Properties

Label 2.97.u_iw
Base field $\F_{97}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple no
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{97}$
Dimension:  $2$
L-polynomial:  $( 1 + 2 x + 97 x^{2} )( 1 + 18 x + 97 x^{2} )$
  $1 + 20 x + 230 x^{2} + 1940 x^{3} + 9409 x^{4}$
Frobenius angles:  $\pm0.532375263179$, $\pm0.866875061252$
Angle rank:  $2$ (numerical)
Jacobians:  $430$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $11600$ $89088000$ $832991742800$ $7836073574400000$ $73742396382405938000$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $118$ $9470$ $912694$ $88513918$ $8587338358$ $832974973310$ $80798255165494$ $7837433646147838$ $760231058620270198$ $73742412707208420350$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 430 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{97}$.

Endomorphism algebra over $\F_{97}$
The isogeny class factors as 1.97.c $\times$ 1.97.s 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 are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.97.au_iw$2$(not in LMFDB)
2.97.aq_gc$2$(not in LMFDB)
2.97.q_gc$2$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.97.au_iw$2$(not in LMFDB)
2.97.aq_gc$2$(not in LMFDB)
2.97.q_gc$2$(not in LMFDB)
2.97.ak_ic$4$(not in LMFDB)
2.97.ag_gw$4$(not in LMFDB)
2.97.g_gw$4$(not in LMFDB)
2.97.k_ic$4$(not in LMFDB)