Invariants
| Base field: | $\F_{67}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 6 x + 18 x^{2} + 402 x^{3} + 4489 x^{4}$ |
| Frobenius angles: | $\pm0.333445870370$, $\pm0.833445870370$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(i, \sqrt{5})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $264$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $4916$ | $20155600$ | $90789223844$ | $406248211360000$ | $1822702211130158756$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $74$ | $4490$ | $301862$ | $20160078$ | $1350024674$ | $90458382170$ | $6060704883902$ | $406067718056158$ | $27206534725131674$ | $1822837804551761450$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 264 curves (of which all are hyperelliptic):
- $y^2=11 x^6+65 x^5+21 x^4+3 x^3+25 x^2+57 x+58$
- $y^2=40 x^6+63 x^5+21 x^4+32 x^3+58 x^2+6 x+30$
- $y^2=42 x^6+9 x^5+32 x^4+47 x^3+61 x^2+17 x+38$
- $y^2=56 x^6+30 x^5+42 x^4+26 x^3+17 x^2+34 x+42$
- $y^2=15 x^6+23 x^5+7 x^4+47 x^2+12 x+52$
- $y^2=7 x^6+8 x^5+26 x^4+37 x^3+50 x^2+44 x+14$
- $y^2=29 x^6+23 x^5+41 x^4+49 x^3+4 x^2+66 x+41$
- $y^2=30 x^6+60 x^5+57 x^4+42 x^3+26 x^2+29 x+12$
- $y^2=22 x^6+45 x^5+4 x^4+11 x^3+54 x^2+55 x+34$
- $y^2=20 x^6+21 x^5+x^4+36 x^3+40 x^2+9 x+47$
- $y^2=54 x^6+14 x^5+39 x^4+54 x^3+12 x^2+21 x+18$
- $y^2=27 x^6+66 x^5+16 x^4+53 x^3+51 x^2+40 x+60$
- $y^2=62 x^6+28 x^5+58 x^4+7 x^3+10 x^2+16 x+25$
- $y^2=10 x^6+24 x^5+60 x^4+35 x^3+10 x^2+55 x+66$
- $y^2=39 x^6+4 x^5+59 x^4+47 x^3+3 x^2+31 x+62$
- $y^2=7 x^6+38 x^5+53 x^4+17 x^3+7 x^2+61 x+24$
- $y^2=66 x^6+25 x^5+11 x^4+49 x^3+32 x^2+41 x+30$
- $y^2=31 x^6+49 x^5+33 x^4+29 x^3+3 x^2+17 x+28$
- $y^2=42 x^6+20 x^5+22 x^4+58 x^3+47 x^2+46 x+60$
- $y^2=5 x^6+17 x^5+32 x^2+63 x+17$
- and 244 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{67^{4}}$.
Endomorphism algebra over $\F_{67}$| The endomorphism algebra of this simple isogeny class is \(\Q(i, \sqrt{5})\). |
| The base change of $A$ to $\F_{67^{4}}$ is 1.20151121.gqg 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-5}) \)$)$ |
- Endomorphism algebra over $\F_{67^{2}}$
The base change of $A$ to $\F_{67^{2}}$ is the simple isogeny class 2.4489.a_gqg and its endomorphism algebra is \(\Q(i, \sqrt{5})\).
Base change
This is a primitive isogeny class.