Properties

Label 2.73.ai_fm
Base field $\F_{73}$
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:  $\F_{73}$
Dimension:  $2$
L-polynomial:  $1 - 8 x + 142 x^{2} - 584 x^{3} + 5329 x^{4}$
Frobenius angles:  $\pm0.334877010546$, $\pm0.508795915501$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-16 + \sqrt{5}})\)
Galois group:  $D_{4}$
Jacobians:  $234$
Cyclic group of points:    no
Non-cyclic primes:   $2$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4880$ $29592320$ $151779912080$ $806305494118400$ $4297553507933082000$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $66$ $5550$ $390162$ $28392798$ $2073036706$ $151334215950$ $11047394114802$ $806460066764478$ $58871587312520706$ $4297625835588976750$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 234 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{73}$.

Endomorphism algebra over $\F_{73}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-16 + \sqrt{5}})\).

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.73.i_fm$2$(not in LMFDB)