Invariants
| Base field: | $\F_{67}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 2 x + 70 x^{2} + 134 x^{3} + 4489 x^{4}$ |
| Frobenius angles: | $\pm0.358021167718$, $\pm0.686733147249$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-202 +2 \sqrt{65}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $240$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $4696$ | $20775104$ | $90454826296$ | $406232727197696$ | $1822779915704554936$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $70$ | $4626$ | $300754$ | $20159310$ | $1350082230$ | $90457285602$ | $6060715747618$ | $406067715021534$ | $27206534370824038$ | $1822837806347587186$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 240 curves (of which all are hyperelliptic):
- $y^2=17 x^6+23 x^5+6 x^4+57 x^3+47 x^2+15 x+4$
- $y^2=34 x^6+45 x^5+36 x^4+57 x^3+47 x^2+48 x+17$
- $y^2=17 x^5+62 x^4+27 x^3+17 x^2+43 x+64$
- $y^2=18 x^6+66 x^5+63 x^4+36 x^3+43 x^2+6 x+20$
- $y^2=64 x^6+35 x^5+34 x^4+56 x^3+38 x^2+57 x+22$
- $y^2=48 x^6+59 x^5+65 x^4+41 x^3+24 x^2+31 x+53$
- $y^2=47 x^6+37 x^5+59 x^4+32 x^3+55 x^2+55 x+16$
- $y^2=56 x^6+18 x^5+49 x^4+58 x^3+20 x^2+6 x+39$
- $y^2=34 x^6+7 x^5+17 x^4+7 x^3+33 x^2+60 x+19$
- $y^2=58 x^6+49 x^5+18 x^4+61 x^3+38 x^2+56 x+47$
- $y^2=35 x^6+59 x^5+13 x^4+36 x^3+65 x^2+35 x+38$
- $y^2=47 x^6+32 x^5+47 x^4+20 x^3+64 x^2+32 x+43$
- $y^2=34 x^6+42 x^5+36 x^4+37 x^3+44 x^2+38 x+64$
- $y^2=5 x^6+8 x^5+11 x^4+56 x^3+8 x^2+46 x+23$
- $y^2=63 x^6+31 x^5+62 x^4+9 x^2+44 x+13$
- $y^2=12 x^6+8 x^5+15 x^4+62 x^3+20 x^2+64 x+65$
- $y^2=39 x^6+26 x^5+52 x^4+22 x^3+46 x^2+65 x+18$
- $y^2=51 x^6+33 x^5+61 x^4+13 x^3+15 x^2+14 x+35$
- $y^2=27 x^6+28 x^5+66 x^4+x^3+34 x^2+3 x+30$
- $y^2=24 x^6+15 x^5+30 x^4+4 x^3+66 x^2+38 x+59$
- and 220 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{67}$.
Endomorphism algebra over $\F_{67}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-202 +2 \sqrt{65}})\). |
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 |
|---|---|---|
| 2.67.ac_cs | $2$ | (not in LMFDB) |