Invariants
| Base field: | $\F_{67}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 82 x^{2} + 4489 x^{4}$ |
| Frobenius angles: | $\pm0.354805366095$, $\pm0.645194633905$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{-6}, \sqrt{13})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $424$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2, 3$ |
This isogeny class is simple but not 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $4572$ | $20903184$ | $90457829244$ | $406158564197376$ | $1822837804145664732$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $68$ | $4654$ | $300764$ | $20155630$ | $1350125108$ | $90457276318$ | $6060711605324$ | $406067748000094$ | $27206534396294948$ | $1822837803739568014$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 424 curves (of which all are hyperelliptic):
- $y^2=25 x^6+66 x^5+63 x^4+35 x^3+60 x^2+4 x+12$
- $y^2=50 x^6+65 x^5+59 x^4+3 x^3+53 x^2+8 x+24$
- $y^2=7 x^6+23 x^5+30 x^4+40 x^3+48 x^2+55 x+62$
- $y^2=14 x^6+46 x^5+60 x^4+13 x^3+29 x^2+43 x+57$
- $y^2=26 x^6+13 x^5+66 x^4+63 x^3+29 x^2+53 x+35$
- $y^2=52 x^6+26 x^5+65 x^4+59 x^3+58 x^2+39 x+3$
- $y^2=53 x^6+51 x^5+2 x^4+59 x^3+63 x^2+10 x+42$
- $y^2=39 x^6+35 x^5+4 x^4+51 x^3+59 x^2+20 x+17$
- $y^2=4 x^6+59 x^5+26 x^4+9 x^3+48 x^2+7 x+6$
- $y^2=8 x^6+51 x^5+52 x^4+18 x^3+29 x^2+14 x+12$
- $y^2=48 x^6+40 x^5+65 x^4+25 x^3+38 x^2+6 x+52$
- $y^2=29 x^6+13 x^5+63 x^4+50 x^3+9 x^2+12 x+37$
- $y^2=22 x^6+15 x^5+38 x^4+x^3+20 x^2+29 x$
- $y^2=44 x^6+30 x^5+9 x^4+2 x^3+40 x^2+58 x$
- $y^2=62 x^6+63 x^5+8 x^4+15 x^3+14 x^2+3 x+43$
- $y^2=57 x^6+59 x^5+16 x^4+30 x^3+28 x^2+6 x+19$
- $y^2=38 x^6+40 x^5+17 x^4+42 x^3+16 x^2+24 x+58$
- $y^2=9 x^6+13 x^5+34 x^4+17 x^3+32 x^2+48 x+49$
- $y^2=21 x^6+46 x^5+22 x^4+65 x^3+30 x^2+21 x+33$
- $y^2=42 x^6+25 x^5+44 x^4+63 x^3+60 x^2+42 x+66$
- and 404 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{67^{2}}$.
Endomorphism algebra over $\F_{67}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-6}, \sqrt{13})\). |
| The base change of $A$ to $\F_{67^{2}}$ is 1.4489.de 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-78}) \)$)$ |
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.a_ade | $4$ | (not in LMFDB) |