Invariants
| Base field: | $\F_{67}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 74 x^{2} + 4489 x^{4}$ |
| Frobenius angles: | $\pm0.156886832233$, $\pm0.843113167767$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{13}, \sqrt{-15})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $276$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $4416$ | $19501056$ | $90458973504$ | $406208868581376$ | $1822837803972092736$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $68$ | $4342$ | $300764$ | $20158126$ | $1350125108$ | $90459564838$ | $6060711605324$ | $406067733633118$ | $27206534396294948$ | $1822837803392424022$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 276 curves (of which all are hyperelliptic):
- $y^2=55 x^6+51 x^5+29 x^4+45 x^3+40 x^2+25 x+35$
- $y^2=21 x^6+59 x^5+11 x^4+10 x^3+46 x^2+25 x+30$
- $y^2=42 x^6+51 x^5+22 x^4+20 x^3+25 x^2+50 x+60$
- $y^2=56 x^6+20 x^5+9 x^4+8 x^3+24 x^2+37 x+22$
- $y^2=37 x^6+51 x^5+58 x^4+20 x^3+24 x^2+13 x+65$
- $y^2=7 x^6+35 x^5+49 x^4+40 x^3+48 x^2+26 x+63$
- $y^2=2 x^6+57 x^5+20 x^4+4 x^3+30 x^2+61 x+56$
- $y^2=4 x^6+47 x^5+40 x^4+8 x^3+60 x^2+55 x+45$
- $y^2=45 x^6+7 x^5+58 x^4+46 x^3+57 x^2+56 x+58$
- $y^2=23 x^6+14 x^5+49 x^4+25 x^3+47 x^2+45 x+49$
- $y^2=16 x^6+28 x^5+20 x^4+46 x^3+30 x^2+21 x+23$
- $y^2=27 x^6+31 x^5+12 x^4+64 x^3+33 x^2+10 x+57$
- $y^2=54 x^6+62 x^5+24 x^4+61 x^3+66 x^2+20 x+47$
- $y^2=39 x^5+8 x^4+5 x^3+36 x^2+35 x+34$
- $y^2=11 x^5+16 x^4+10 x^3+5 x^2+3 x+1$
- $y^2=22 x^6+31 x^5+31 x^4+29 x^3+25 x^2+62 x+19$
- $y^2=61 x^6+x^5+6 x^4+25 x^3+28 x^2+45 x+62$
- $y^2=59 x^6+58 x^5+26 x^4+36 x^3+63 x^2+43 x+5$
- $y^2=3 x^6+5 x^5+20 x^4+29 x^3+34 x^2+27 x+43$
- $y^2=6 x^6+10 x^5+40 x^4+58 x^3+x^2+54 x+19$
- and 256 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 \(\Q(\sqrt{13}, \sqrt{-15})\). |
| The base change of $A$ to $\F_{67^{2}}$ is 1.4489.acw 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-195}) \)$)$ |
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_cw | $4$ | (not in LMFDB) |