Invariants
| Base field: | $\F_{67}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 50 x^{2} + 4489 x^{4}$ |
| Frobenius angles: | $\pm0.310858471633$, $\pm0.689141528367$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{21}, \sqrt{-46})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $300$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $4540$ | $20611600$ | $90457833820$ | $406328837760000$ | $1822837807096416700$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $68$ | $4590$ | $300764$ | $20164078$ | $1350125108$ | $90457285470$ | $6060711605324$ | $406067674232158$ | $27206534396294948$ | $1822837809641071950$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 300 curves (of which all are hyperelliptic):
- $y^2=59 x^6+49 x^5+3 x^4+24 x^3+26 x^2+55 x+58$
- $y^2=41 x^6+42 x^5+32 x^4+29 x^3+37 x^2+50 x+35$
- $y^2=39 x^5+52 x^4+54 x^3+15 x^2+61 x+29$
- $y^2=11 x^5+37 x^4+41 x^3+30 x^2+55 x+58$
- $y^2=21 x^6+26 x^5+19 x^4+8 x^3+38 x^2+37 x+34$
- $y^2=3 x^6+10 x^5+11 x^4+60 x^3+2 x^2+39 x+36$
- $y^2=6 x^6+20 x^5+22 x^4+53 x^3+4 x^2+11 x+5$
- $y^2=45 x^6+40 x^5+35 x^3+34 x^2+63 x+9$
- $y^2=23 x^6+13 x^5+3 x^3+x^2+59 x+18$
- $y^2=12 x^6+53 x^5+35 x^4+5 x^2+55 x+40$
- $y^2=24 x^6+39 x^5+3 x^4+10 x^2+43 x+13$
- $y^2=37 x^6+34 x^5+31 x^4+33 x^3+65 x^2+2 x+59$
- $y^2=7 x^6+x^5+62 x^4+66 x^3+63 x^2+4 x+51$
- $y^2=5 x^6+47 x^5+x^4+22 x^3+64 x^2+59 x+6$
- $y^2=10 x^6+27 x^5+2 x^4+44 x^3+61 x^2+51 x+12$
- $y^2=44 x^6+38 x^5+38 x^4+24 x^2+45 x+53$
- $y^2=21 x^6+9 x^5+9 x^4+48 x^2+23 x+39$
- $y^2=58 x^6+53 x^5+32 x^4+43 x^3+15 x^2+22 x+66$
- $y^2=49 x^6+39 x^5+64 x^4+19 x^3+30 x^2+44 x+65$
- $y^2=34 x^6+58 x^5+15 x^4+26 x^3+2 x^2+59 x+48$
- and 280 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 \(\Q(\sqrt{21}, \sqrt{-46})\). |
| The base change of $A$ to $\F_{67^{2}}$ is 1.4489.by 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-966}) \)$)$ |
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_aby | $4$ | (not in LMFDB) |