Invariants
Base field: | $\F_{2}$ |
Dimension: | $5$ |
L-polynomial: | $( 1 - x + 2 x^{2} )( 1 + 2 x^{2} )( 1 - 2 x + 2 x^{2} )^{3}$ |
$1 - 7 x + 28 x^{2} - 76 x^{3} + 156 x^{4} - 248 x^{5} + 312 x^{6} - 304 x^{7} + 224 x^{8} - 112 x^{9} + 32 x^{10}$ | |
Frobenius angles: | $\pm0.250000000000$, $\pm0.250000000000$, $\pm0.250000000000$, $\pm0.384973271919$, $\pm0.5$ |
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: | $1$ |
Slopes: | $[0, 1/2, 1/2, 1/2, 1/2, 1/2, 1/2, 1/2, 1/2, 1]$ |
Point counts
Point counts of the abelian variety
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $6$ | $9000$ | $276822$ | $2250000$ | $50036646$ |
Point counts of the (virtual) curve
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $-4$ | $12$ | $26$ | $32$ | $46$ | $72$ | $94$ | $160$ | $422$ | $1032$ |
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 $\F_{2^{8}}$.
Endomorphism algebra over $\F_{2}$The isogeny class factors as 1.2.ac 3 $\times$ 1.2.ab $\times$ 1.2.a 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 $\F_{2^{8}}$ is 1.256.abg 4 $\times$ 1.256.bf. 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 3 $\times$ 1.4.d $\times$ 1.4.e. The endomorphism algebra for each factor is: - 1.4.a 3 : $\mathrm{M}_{3}($\(\Q(\sqrt{-1}) \)$)$
- 1.4.d : \(\Q(\sqrt{-7}) \).
- 1.4.e : the quaternion algebra over \(\Q\) ramified at $2$ and $\infty$.
- Endomorphism algebra over $\F_{2^{4}}$
The base change of $A$ to $\F_{2^{4}}$ is 1.16.ai $\times$ 1.16.ab $\times$ 1.16.i 3 . The endomorphism algebra for each factor is:
Base change
This is a primitive isogeny class.