Properties

Label 2.2.a_ab
Base Field $\F_{2}$
Dimension $2$
$p$-rank $2$
Principally polarizable
Contains a Jacobian

Learn more about

Invariants

Base field:  $\F_{2}$
Dimension:  $2$
Weil polynomial:  $1 - x^{2} + 4 x^{4}$
Frobenius angles:  $\pm0.209784688372$, $\pm0.790215311628$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{-3}, \sqrt{5})\)
Galois group:  $V_4$

This isogeny class is simple.

Newton polygon

This isogeny class is ordinary.

$p$-rank:  $2$
Slopes:  $[0, 0, 1, 1]$

Point counts

This isogeny class contains a Jacobian, and hence is principally polarizable.

Point counts of the abelian variety

$r$ 1 2 3 4 5 6 7 8 9 10
$A(\F_{q^r})$ 4 16 76 576 964 5776 16636 57600 261364 929296

Point counts of the curve

$r$ 1 2 3 4 5 6 7 8 9 10
$C(\F_{q^r})$ 3 3 9 31 33 87 129 223 513 903

Decomposition

This is a simple isogeny class.

Base change

This is a primitive isogeny class.