Properties

Label 2.67.a_eo
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:  $( 1 - 4 x + 67 x^{2} )( 1 + 4 x + 67 x^{2} )$
  $1 + 118 x^{2} + 4489 x^{4}$
Frobenius angles:  $\pm0.421429069538$, $\pm0.578570930462$
Angle rank:  $1$ (numerical)
Jacobians:  $425$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4608$ $21233664$ $90458436096$ $405868407422976$ $1822837802440647168$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $68$ $4726$ $300764$ $20141230$ $1350125108$ $90458490022$ $6060711605324$ $406067709235294$ $27206534396294948$ $1822837800329532886$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 425 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{67^{2}}$.

Endomorphism algebra over $\F_{67}$
The isogeny class factors as 1.67.ae $\times$ 1.67.e and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:
Endomorphism algebra over $\overline{\F}_{67}$
The base change of $A$ to $\F_{67^{2}}$ is 1.4489.eo 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-7}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.67.ai_fu$2$(not in LMFDB)
2.67.i_fu$2$(not in LMFDB)
2.67.a_aeo$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.67.ai_fu$2$(not in LMFDB)
2.67.i_fu$2$(not in LMFDB)
2.67.a_aeo$4$(not in LMFDB)
2.67.ae_abz$6$(not in LMFDB)
2.67.e_abz$6$(not in LMFDB)