Invariants
| Base field: | $\F_{71}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 8 x + 71 x^{2} )( 1 + 9 x + 71 x^{2} )$ |
| $1 + x + 70 x^{2} + 71 x^{3} + 5041 x^{4}$ | |
| Frobenius angles: | $\pm0.342551982147$, $\pm0.679331255589$ |
| Angle rank: | $2$ (numerical) |
| Jacobians: | $256$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
This isogeny class is not 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $5184$ | $26127360$ | $128101015296$ | $646016847114240$ | $3255197456935917504$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $73$ | $5181$ | $357916$ | $25422041$ | $1804203803$ | $128098883358$ | $9095122591733$ | $645753576446161$ | $45848500731147316$ | $3255243554720630901$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 256 curves (of which all are hyperelliptic):
- $y^2=16 x^6+46 x^5+x^4+35 x^3+41 x^2+x+26$
- $y^2=31 x^6+33 x^5+55 x^4+54 x^3+47 x^2+36 x+37$
- $y^2=29 x^6+65 x^5+40 x^4+10 x^3+12 x^2+16 x+46$
- $y^2=51 x^6+56 x^5+52 x^4+44 x^3+52 x^2+16 x+59$
- $y^2=30 x^6+70 x^5+27 x^4+47 x^3+7 x^2+60 x+65$
- $y^2=55 x^6+35 x^4+7 x^3+22 x^2+35$
- $y^2=10 x^6+55 x^5+53 x^4+62 x^3+8 x^2+34 x+61$
- $y^2=67 x^6+65 x^5+58 x^4+40 x^3+47 x^2+17 x+58$
- $y^2=60 x^6+15 x^5+67 x^4+51 x^3+5 x^2+62 x+6$
- $y^2=52 x^6+3 x^5+17 x^4+63 x^3+8 x^2+26 x+24$
- $y^2=25 x^6+5 x^5+32 x^4+50 x^3+30 x^2+52 x+70$
- $y^2=53 x^6+22 x^5+64 x^4+70 x^3+18 x^2+56 x+12$
- $y^2=17 x^6+65 x^5+15 x^4+52 x^3+25 x^2+6 x+31$
- $y^2=52 x^6+19 x^5+10 x^4+19 x^3+70 x^2+9 x+44$
- $y^2=35 x^6+55 x^5+65 x^4+65 x^3+31 x^2+x+25$
- $y^2=38 x^6+5 x^5+50 x^4+56 x^3+11 x^2+23 x+9$
- $y^2=55 x^6+34 x^5+5 x^4+63 x^3+50 x^2+21 x+25$
- $y^2=40 x^6+56 x^5+26 x^4+19 x^3+x^2+18 x+55$
- $y^2=22 x^6+30 x^5+35 x^4+63 x^3+34 x^2+55 x+40$
- $y^2=9 x^6+37 x^5+60 x^4+59 x^3+4 x^2+8 x+16$
- and 236 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{71}$.
Endomorphism algebra over $\F_{71}$| The isogeny class factors as 1.71.ai $\times$ 1.71.j and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is: |
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.ar_ig | $2$ | (not in LMFDB) |
| 2.71.ab_cs | $2$ | (not in LMFDB) |
| 2.71.r_ig | $2$ | (not in LMFDB) |