Invariants
Base field: | $\F_{3}$ |
Dimension: | $2$ |
L-polynomial: | $1 + x + x^{2} + 3 x^{3} + 9 x^{4}$ |
Frobenius angles: | $\pm0.327011428181$, $\pm0.798251144367$ |
Angle rank: | $2$ (numerical) |
Number field: | 4.0.16317.1 |
Galois group: | $D_{4}$ |
Jacobians: | $2$ |
Isomorphism classes: | 2 |
This isogeny class is simple and 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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $15$ | $105$ | $945$ | $8925$ | $49200$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $5$ | $11$ | $35$ | $107$ | $200$ | $719$ | $2105$ | $6563$ | $20195$ | $58886$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 2 curves (of which all are hyperelliptic), and hence is principally polarizable:
- $y^2=2x^5+2x^4+x+2$
- $y^2=2x^6+x^4+2x^3+x^2+x$
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{3}$.
Endomorphism algebra over $\F_{3}$The endomorphism algebra of this simple isogeny class is 4.0.16317.1. |
Base change
This is a primitive isogeny class.
Twists
Below is a list of all twists of this isogeny class.
Twist | Extension degree | Common base change |
---|---|---|
2.3.ab_b | $2$ | 2.9.b_n |