Properties

Label 2.47.g_ck
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:  $1 + 6 x + 62 x^{2} + 282 x^{3} + 2209 x^{4}$
Frobenius angles:  $\pm0.420161527555$, $\pm0.740544606279$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-138 +6 \sqrt{41}})\)
Galois group:  $D_{4}$
Jacobians:  $176$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $2560$ $5079040$ $10773598720$ $23821103923200$ $52588401242636800$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $54$ $2298$ $103770$ $4881694$ $229298214$ $10779192186$ $506625712458$ $23811281296126$ $1119130454487510$ $52599132000373818$

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 $\F_{47}$.

Endomorphism algebra over $\F_{47}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-138 +6 \sqrt{41}})\).

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_ck$2$(not in LMFDB)