Invariants
Base field: | $\F_{13}$ |
Dimension: | $2$ |
L-polynomial: | $1 - 7 x + 35 x^{2} - 91 x^{3} + 169 x^{4}$ |
Frobenius angles: | $\pm0.237011831794$, $\pm0.424372211187$ |
Angle rank: | $2$ (numerical) |
Number field: | 4.0.198237.1 |
Galois group: | $D_{4}$ |
Jacobians: | $4$ |
Isomorphism classes: | 4 |
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
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
---|---|---|---|---|---|
$A(\F_{q^r})$ | $107$ | $32421$ | $5096303$ | $819635301$ | $137816498192$ |
$r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
---|---|---|---|---|---|---|---|---|---|---|
$C(\F_{q^r})$ | $7$ | $191$ | $2317$ | $28699$ | $371182$ | $4828511$ | $62756701$ | $815695123$ | $10604137495$ | $137857661846$ |
Jacobians and polarizations
This isogeny class contains the Jacobians of 4 curves (of which all are hyperelliptic), and hence is principally polarizable:
- $y^2=5x^6+11x^5+6x^4+6x^3+9x^2+2x+6$
- $y^2=5x^6+4x^5+6x^4+7x^3+9x^2+8x+7$
- $y^2=8x^6+5x^5+2x^4+7x^3+7x^2+x+11$
- $y^2=2x^6+x^5+10x^4+12x^3+5x^2+10x+7$
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{13}$.
Endomorphism algebra over $\F_{13}$The endomorphism algebra of this simple isogeny class is 4.0.198237.1. |
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 |
---|---|---|
2.13.h_bj | $2$ | 2.169.v_ld |