Properties

Label 2.47.g_bm
Base field $\F_{47}$
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:  $\F_{47}$
Dimension:  $2$
L-polynomial:  $1 + 6 x + 38 x^{2} + 282 x^{3} + 2209 x^{4}$
Frobenius angles:  $\pm0.379630676201$, $\pm0.798801462028$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-114 +6 \sqrt{65}})\)
Galois group:  $D_{4}$
Jacobians:  $280$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $2536$ $4970560$ $10818548104$ $23827671705600$ $52585594411984456$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $54$ $2250$ $104202$ $4883038$ $229285974$ $10779247050$ $506623392042$ $23811293061118$ $1119130545847734$ $52599131409530250$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 280 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{47}$.

Endomorphism algebra over $\F_{47}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-114 +6 \sqrt{65}})\).

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.47.ag_bm$2$(not in LMFDB)