Properties

Label 2.67.al_fd
Base field $\F_{67}$
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:  $\F_{67}$
Dimension:  $2$
L-polynomial:  $1 - 11 x + 133 x^{2} - 737 x^{3} + 4489 x^{4}$
Frobenius angles:  $\pm0.263089365804$, $\pm0.501753261616$
Angle rank:  $2$ (numerical)
Number field:  4.0.971525.1
Galois group:  $D_{4}$
Jacobians:  $114$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $3875$ $20812625$ $90713715125$ $406065240378125$ $1822894896023550000$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $57$ $4635$ $301611$ $20151003$ $1350167392$ $90458836455$ $6060707088801$ $406067599152483$ $27206534279541927$ $1822837808327268550$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 114 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{67}$.

Endomorphism algebra over $\F_{67}$
The endomorphism algebra of this simple isogeny class is 4.0.971525.1.

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.67.l_fd$2$(not in LMFDB)