Properties

Label 2.67.e_ag
Base field $\F_{67}$
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:  $\F_{67}$
Dimension:  $2$
L-polynomial:  $( 1 - 10 x + 67 x^{2} )( 1 + 14 x + 67 x^{2} )$
  $1 + 4 x - 6 x^{2} + 268 x^{3} + 4489 x^{4}$
Frobenius angles:  $\pm0.290828956352$, $\pm0.826557230848$
Angle rank:  $2$ (numerical)
Jacobians:  $276$
Cyclic group of points:    no
Non-cyclic primes:   $2$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4756$ $20032272$ $90741631156$ $406328835953664$ $1822761340857582676$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $72$ $4462$ $301704$ $20164078$ $1350068472$ $90458560222$ $6060702861432$ $406067670619486$ $27206534578101288$ $1822837805327000782$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 276 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{67}$
The isogeny class factors as 1.67.ak $\times$ 1.67.o 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 is a list of all twists of this isogeny class.

TwistExtension degreeCommon base change
2.67.ay_ko$2$(not in LMFDB)
2.67.ae_ag$2$(not in LMFDB)
2.67.y_ko$2$(not in LMFDB)