Invariants
Base field: | $\F_{2^{5}}$ |
Dimension: | $2$ |
L-polynomial: | $1 - 14 x + 95 x^{2} - 448 x^{3} + 1024 x^{4}$ |
Frobenius angles: | $\pm0.0356965878095$, $\pm0.421632723418$ |
Angle rank: | $2$ (numerical) |
Number field: | 4.0.12352.2 |
Galois group: | $D_{4}$ |
Jacobians: | $15$ |
Isomorphism classes: | 15 |
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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $658$ | $1040956$ | $1070512702$ | $1096393152736$ | $1125204363503458$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $19$ | $1019$ | $32671$ | $1045599$ | $33533699$ | $1073696699$ | $34359842543$ | $1099511133823$ | $35184356292115$ | $1125899825493179$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 15 curves (of which all are hyperelliptic), and hence is principally polarizable:
- $y^2+(x^2+x+a^4+a^3)y=(a^2+a+1)x^5+(a^2+a)x^3+(a^3+a^2)x+a^4+a^3$
- $y^2+(x^2+x+a^2+1)y=(a+1)x^5+(a^3+a^2+a+1)x^3+(a+1)x+a^4+a^3+1$
- $y^2+(x^2+x+a^4+1)y=(a^2+1)x^5+(a^4+a^3+a^2+a+1)x^3+(a^2+1)x+a^2+a$
- $y^2+(x^2+x+a^2+a+1)y=(a^4+a^2+1)x^5+(a^4+a^2)x^3+(a^4+a^3+a)x+a^2+a+1$
- $y^2+(x^2+x+a^4+a^3+a^2)y=(a^4+a^3)x^5+(a^4+a^3+1)x^3+(a^2+a)x+a^4+a^3+a^2$
- $y^2+(x^2+x+a^3+a^2)y=(a^4+1)x^5+(a^4+a)x^3+(a^4+1)x+a^4+a^2$
- $y^2+(x^2+x+a^4+a^2+1)y=(a^4+a^3+a^2)x^5+(a^4+a^3+a^2+1)x^3+(a+1)x+a^4+a^2+1$
- $y^2+(x^2+x+a^4+a^2+a+1)y=(a^2+a+1)x^5+(a^2+a)x^3+(a^4+a^2)x+a^4+a^2+a+1$
- $y^2+(x^2+x+a^4+a^3+a)y=(a^3+a^2)x^5+(a^3+1)x^3+(a^3+a^2)x+a^4+a^3+a^2+1$
- $y^2+(x^2+x+a^4+a^3+a^2)y=(a^4+a^2+a+1)x^5+(a^4+a^2+a)x^3+(a^2+1)x+a^4+a^3+a^2$
- $y^2+(x^2+x+a^4+a^3)y=(a^4+a^2+1)x^5+(a^4+a^2)x^3+(a^4+a^3+a^2+1)x+a^4+a^3$
- $y^2+(x^2+x+a^4+a^2+a+1)y=(a^4+a^3)x^5+(a^4+a^3+1)x^3+(a^4+1)x+a^4+a^2+a+1$
- $y^2+(x^2+x+a+1)y=(a^4+a^3+a)x^5+(a^3+a+1)x^3+(a^4+a^3+a)x+a^4+a^2+a$
- $y^2+(x^2+x+a^4+a^2+1)y=(a^4+a^2+a+1)x^5+(a^4+a^2+a)x^3+(a^4+a^3+1)x+a^4+a^2+1$
- $y^2+(x^2+x+a^2+a+1)y=(a^4+a^3+a^2)x^5+(a^4+a^3+a^2+1)x^3+(a^4+a^2+a)x+a^2+a+1$
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{2^{5}}$.
Endomorphism algebra over $\F_{2^{5}}$The endomorphism algebra of this simple isogeny class is 4.0.12352.2. |
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 |
---|---|---|
2.32.o_dr | $2$ | 2.1024.ag_acep |