Properties

Label 2.67.ao_ez
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

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Invariants

Base field:  $\F_{67}$
Dimension:  $2$
L-polynomial:  $1 - 14 x + 129 x^{2} - 938 x^{3} + 4489 x^{4}$
Frobenius angles:  $\pm0.159890564181$, $\pm0.506776102485$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{-2}, \sqrt{-3})\)
Galois group:  $C_2^2$
Jacobians:  $131$
Cyclic group of points:    yes

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $3667$ $20428857$ $90416881636$ $405964227903129$ $1822928517221101027$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $54$ $4552$ $300624$ $20145988$ $1350192294$ $90459575422$ $6060715456626$ $406067663612356$ $27206534521929408$ $1822837806365469832$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 131 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{67^{3}}$.

Endomorphism algebra over $\F_{67}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-2}, \sqrt{-3})\).
Endomorphism algebra over $\overline{\F}_{67}$
The base change of $A$ to $\F_{67^{3}}$ is 1.300763.acs 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-2}) \)$)$

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.o_ez$2$(not in LMFDB)
2.67.bc_ms$3$(not in LMFDB)
2.67.abc_ms$6$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.67.o_ez$2$(not in LMFDB)
2.67.bc_ms$3$(not in LMFDB)
2.67.abc_ms$6$(not in LMFDB)
2.67.a_ack$6$(not in LMFDB)
2.67.a_ck$12$(not in LMFDB)
2.67.am_cu$24$(not in LMFDB)
2.67.m_cu$24$(not in LMFDB)