Properties

Label 2.67.c_c
Base field $\F_{67}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

Related objects

Downloads

Learn more

Invariants

Base field:  $\F_{67}$
Dimension:  $2$
L-polynomial:  $1 + 2 x + 2 x^{2} + 134 x^{3} + 4489 x^{4}$
Frobenius angles:  $\pm0.277532102617$, $\pm0.777532102617$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(i, \sqrt{133})\)
Galois group:  $C_2^2$
Jacobians:  $196$
Cyclic group of points:    no
Non-cyclic primes:   $2$

This isogeny class is simple but not 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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4628$ $20159568$ $90578165444$ $406408181946624$ $1822778996750956868$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $70$ $4490$ $301162$ $20168014$ $1350081550$ $90458382170$ $6060707642290$ $406067615491294$ $27206534723883574$ $1822837804551761450$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 196 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{67^{4}}$.

Endomorphism algebra over $\F_{67}$
The endomorphism algebra of this simple isogeny class is \(\Q(i, \sqrt{133})\).
Endomorphism algebra over $\overline{\F}_{67}$
The base change of $A$ to $\F_{67^{4}}$ is 1.20151121.mmw 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-133}) \)$)$
Remainder of endomorphism lattice by field

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.ac_c$2$(not in LMFDB)
2.67.a_afc$8$(not in LMFDB)
2.67.a_fc$8$(not in LMFDB)