Invariants
Base field: | $\F_{2^{6}}$ |
Dimension: | $2$ |
L-polynomial: | $1 - 26 x + 295 x^{2} - 1664 x^{3} + 4096 x^{4}$ |
Frobenius angles: | $\pm0.142916203509$, $\pm0.242250011848$ |
Angle rank: | $2$ (numerical) |
Number field: | 4.0.375872.1 |
Galois group: | $D_{4}$ |
Jacobians: | $12$ |
Isomorphism classes: | 12 |
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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $2702$ | $16433564$ | $68835716978$ | $281642495355872$ | $1153020866492287422$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $39$ | $4011$ | $262587$ | $16787199$ | $1073834359$ | $68720025675$ | $4398048285579$ | $281474974000575$ | $18014398449963591$ | $1152921504563117611$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 12 curves (of which all are hyperelliptic), and hence is principally polarizable:
- $y^2+(x^2+x+a^3+a)y=(a^3+a^2+1)x^5+a^3x^4+(a^4+a^2+a+1)x^3+a^3x^2+(a^5+a^4+a^3+a^2+a)x+a^4+a^3+a^2$
- $y^2+(x^2+x+a^4+a^3+a^2+a+1)y=(a^3+a)x^5+(a^4+a^3+a)x^4+(a^5+a)x^3+(a^4+a^3+a)x^2+(a^3+1)x+a^2+1$
- $y^2+(x^2+x+a^5+a^4+a^3+1)y=(a^4+a^3+a^2+a+1)x^5+(a^3+a^2+1)x^4+(a^5+a^4+a^2+1)x^3+(a^3+a^2+1)x^2+(a^4+a^3+a)x+a^4+a$
- $y^2+(x^2+x+a^4+a^3+a^2)y=(a^5+a^4+a^3+1)x^5+(a^3+1)x^4+(a^4+a^2+a+1)x^3+(a^3+1)x^2+(a^5+a^3)x+a^5+a^3+a^2$
- $y^2+(x^2+x+a^3+1)y=(a^5+a^4+a^3+a^2+a)x^5+ax^3+(a^5+a^4+a^3)x+a^2+a$
- $y^2+(x^2+x+a^5+a^4+a^3+a^2)y=(a^4+a^3+a^2)x^5+(a^3+a+1)x^4+(a^5+a)x^3+(a^3+a+1)x^2+(a^5+a^3+a)x+a^3+a$
- $y^2+(x^2+x+a^5+a^3+a^2+a)y=(a^5+a^3+a)x^5+(a^4+a+1)x^3+(a^3+a+1)x+a^5+1$
- $y^2+(x^2+x+a^4+a^3+a)y=(a^3+1)x^5+a^2x^3+(a^4+a^3+a^2+1)x+a^4+a^2$
- $y^2+(x^2+x+a^3+a^2+1)y=(a^5+a^4+a^3+a^2)x^5+(a^3+1)x^4+(a^5+a^4+a^2+1)x^3+(a^3+1)x^2+(a^5+a^3+a^2+a)x+a^5+a^4+a^3+a^2+a+1$
- $y^2+(x^2+x+a^5+a^4+a^3+a^2+a)y=(a^5+a^3+a^2+a)x^5+(a^5+a^4+a)x^3+(a^4+a^3+a^2+a)x+a^5+a^4$
- $y^2+(x^2+x+a^5+a^3+a)y=(a^5+a^3)x^5+(a^5+a^4+a^2+a+1)x^3+(a^3+a^2)x+a^5+a^2$
- $y^2+(x^2+x+a^5+a^3)y=(a^4+a^3+a)x^5+a^4x^3+(a^5+a^4+a^3+a^2+1)x+a^5+a^2+a+1$
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{2^{6}}$.
Endomorphism algebra over $\F_{2^{6}}$The endomorphism algebra of this simple isogeny class is 4.0.375872.1. |
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 |
---|---|---|
2.64.ba_lj | $2$ | (not in LMFDB) |