Invariants
| Base field: | $\F_{71}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 18 x^{2} + 5041 x^{4}$ |
| Frobenius angles: | $\pm0.229771007001$, $\pm0.770228992999$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{10}, \sqrt{-31})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $260$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $5024$ | $25240576$ | $128100550304$ | $646249611673600$ | $3255243548867935904$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $72$ | $5006$ | $357912$ | $25431198$ | $1804229352$ | $128100816686$ | $9095120158392$ | $645753442455358$ | $45848500718449032$ | $3255243546725990606$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 260 curves (of which all are hyperelliptic):
- $y^2=33 x^6+7 x^5+63 x^4+65 x^3+30 x^2+23 x+27$
- $y^2=9 x^6+44 x^5+17 x^4+49 x^3+2 x^2+34 x+52$
- $y^2=63 x^6+24 x^5+48 x^4+59 x^3+14 x^2+25 x+9$
- $y^2=51 x^6+65 x^5+60 x^4+2 x^3+50 x^2+49 x+21$
- $y^2=35 x^6+43 x^5+10 x^4+65 x^3+30 x^2+51 x+6$
- $y^2=32 x^6+17 x^5+70 x^4+29 x^3+68 x^2+2 x+42$
- $y^2=60 x^6+48 x^5+46 x^4+15 x^3+40 x^2+50 x+34$
- $y^2=65 x^6+52 x^5+38 x^4+34 x^3+67 x^2+66 x+25$
- $y^2=61 x^6+13 x^5+28 x^4+28 x^3+30 x^2+13 x+14$
- $y^2=x^6+20 x^5+54 x^4+54 x^3+68 x^2+20 x+27$
- $y^2=29 x^6+67 x^5+39 x^4+20 x^3+65 x^2+19 x+21$
- $y^2=61 x^6+43 x^5+60 x^4+69 x^3+29 x^2+62 x+5$
- $y^2=50 x^6+31 x^5+23 x^4+26 x^3+27 x^2+8 x+28$
- $y^2=66 x^6+4 x^5+19 x^4+40 x^3+47 x^2+56 x+54$
- $y^2=18 x^6+68 x^5+57 x^4+8 x^3+39 x^2+13 x+27$
- $y^2=55 x^6+50 x^5+44 x^4+56 x^3+60 x^2+20 x+47$
- $y^2=50 x^6+38 x^5+47 x^4+11 x^3+23 x+68$
- $y^2=66 x^6+53 x^5+45 x^4+6 x^3+19 x+50$
- $y^2=62 x^6+27 x^5+9 x^4+41 x^3+8 x^2+47 x+57$
- $y^2=8 x^6+47 x^5+63 x^4+3 x^3+56 x^2+45 x+44$
- and 240 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 \(\Q(\sqrt{10}, \sqrt{-31})\). |
| The base change of $A$ to $\F_{71^{2}}$ is 1.5041.as 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-310}) \)$)$ |
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_s | $4$ | (not in LMFDB) |