Invariants
| Base field: | $\F_{71}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 74 x^{2} + 5041 x^{4}$ |
| Frobenius angles: | $\pm0.337244063214$, $\pm0.662755936786$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{-6}, \sqrt{17})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $256$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $5116$ | $26173456$ | $128099570044$ | $645987695698944$ | $3255243552417538876$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $72$ | $5190$ | $357912$ | $25420894$ | $1804229352$ | $128098856166$ | $9095120158392$ | $645753590462014$ | $45848500718449032$ | $3255243553825196550$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 256 curves (of which all are hyperelliptic):
- $y^2=34 x^6+8 x^5+44 x^4+54 x^3+54 x^2+63 x+1$
- $y^2=25 x^6+56 x^5+24 x^4+23 x^3+23 x^2+15 x+7$
- $y^2=18 x^6+30 x^4+65 x^3+30 x^2+53 x+5$
- $y^2=55 x^6+68 x^4+29 x^3+68 x^2+16 x+35$
- $y^2=70 x^6+11 x^5+36 x^4+13 x^3+59 x^2+17 x+50$
- $y^2=55 x^6+57 x^5+6 x^4+37 x^3+39 x^2+33 x+32$
- $y^2=30 x^6+44 x^5+42 x^4+46 x^3+60 x^2+18 x+11$
- $y^2=36 x^6+14 x^5+14 x^4+52 x^3+3 x^2+26 x+52$
- $y^2=61 x^6+30 x^4+35 x^3+63 x^2+43$
- $y^2=47 x^6+50 x^5+49 x^4+44 x^3+54 x^2+62 x+58$
- $y^2=45 x^6+66 x^5+59 x^4+24 x^3+23 x^2+8 x+51$
- $y^2=5 x^6+60 x^5+55 x^4+33 x^3+19 x^2+42 x+67$
- $y^2=35 x^6+65 x^5+30 x^4+18 x^3+62 x^2+10 x+43$
- $y^2=7 x^6+42 x^5+62 x^4+43 x^3+20 x^2+47 x+1$
- $y^2=47 x^6+69 x^5+25 x^4+62 x^3+33 x^2+48 x+63$
- $y^2=45 x^6+57 x^5+33 x^4+8 x^3+18 x^2+52 x+15$
- $y^2=43 x^6+54 x^5+9 x^4+49 x^3+34 x^2+62 x+55$
- $y^2=17 x^6+23 x^5+63 x^4+59 x^3+25 x^2+8 x+30$
- $y^2=27 x^6+3 x^5+13 x^4+17 x^3+6 x^2+4 x+33$
- $y^2=18 x^6+12 x^5+45 x^4+68 x^3+62 x^2+66 x+24$
- and 236 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{71^{2}}$.
Endomorphism algebra over $\F_{71}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-6}, \sqrt{17})\). |
| The base change of $A$ to $\F_{71^{2}}$ is 1.5041.cw 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-102}) \)$)$ |
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 |
|---|---|---|
| 2.71.a_acw | $4$ | (not in LMFDB) |