Invariants
Base field: | $\F_{2}$ |
Dimension: | $4$ |
L-polynomial: | $( 1 - 2 x + 2 x^{2} )^{2}( 1 - x - x^{2} - 2 x^{3} + 4 x^{4} )$ |
$1 - 5 x + 11 x^{2} - 14 x^{3} + 16 x^{4} - 28 x^{5} + 44 x^{6} - 40 x^{7} + 16 x^{8}$ | |
Frobenius angles: | $\pm0.0516399385854$, $\pm0.250000000000$, $\pm0.250000000000$, $\pm0.718306605252$ |
Angle rank: | $1$ (numerical) |
Jacobians: | $0$ |
This isogeny class is not simple, primitive, not ordinary, and not supersingular. It is principally polarizable.
Newton polygon
$p$-rank: | $2$ |
Slopes: | $[0, 0, 1/2, 1/2, 1/2, 1/2, 1, 1]$ |
Point counts
Point counts of the abelian variety
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $1$ | $175$ | $2704$ | $161875$ | $1262431$ |
Point counts of the (virtual) curve
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $-2$ | $2$ | $7$ | $34$ | $38$ | $47$ | $110$ | $162$ | $439$ | $1082$ |
Jacobians and polarizations
This isogeny class is principally polarizable, but does not contain a Jacobian.
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{2^{12}}$.
Endomorphism algebra over $\F_{2}$The isogeny class factors as 1.2.ac 2 $\times$ 2.2.ab_ab and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:
|
The base change of $A$ to $\F_{2^{12}}$ is 1.4096.bv 2 $\times$ 1.4096.ey 2 . The endomorphism algebra for each factor is:
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- Endomorphism algebra over $\F_{2^{2}}$
The base change of $A$ to $\F_{2^{2}}$ is 1.4.a 2 $\times$ 2.4.ad_f. The endomorphism algebra for each factor is: - 1.4.a 2 : $\mathrm{M}_{2}($\(\Q(\sqrt{-1}) \)$)$
- 2.4.ad_f : \(\Q(\sqrt{-3}, \sqrt{-7})\).
- Endomorphism algebra over $\F_{2^{3}}$
The base change of $A$ to $\F_{2^{3}}$ is 1.8.af 2 $\times$ 1.8.e 2 . The endomorphism algebra for each factor is: - 1.8.af 2 : $\mathrm{M}_{2}($\(\Q(\sqrt{-7}) \)$)$
- 1.8.e 2 : $\mathrm{M}_{2}($\(\Q(\sqrt{-1}) \)$)$
- Endomorphism algebra over $\F_{2^{4}}$
The base change of $A$ to $\F_{2^{4}}$ is 1.16.i 2 $\times$ 2.16.b_ap. The endomorphism algebra for each factor is: - 1.16.i 2 : $\mathrm{M}_{2}(B)$, where $B$ is the quaternion algebra over \(\Q\) ramified at $2$ and $\infty$.
- 2.16.b_ap : \(\Q(\sqrt{-3}, \sqrt{-7})\).
- Endomorphism algebra over $\F_{2^{6}}$
The base change of $A$ to $\F_{2^{6}}$ is 1.64.aj 2 $\times$ 1.64.a 2 . The endomorphism algebra for each factor is: - 1.64.aj 2 : $\mathrm{M}_{2}($\(\Q(\sqrt{-7}) \)$)$
- 1.64.a 2 : $\mathrm{M}_{2}($\(\Q(\sqrt{-1}) \)$)$
Base change
This is a primitive isogeny class.