Invariants
| Base field: | $\F_{71}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 14 x^{2} + 5041 x^{4}$ |
| Frobenius angles: | $\pm0.265716864985$, $\pm0.734283135015$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{2}, \sqrt{-39})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $418$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $5056$ | $25563136$ | $128100074944$ | $646256119578624$ | $3255243552720074176$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $72$ | $5070$ | $357912$ | $25431454$ | $1804229352$ | $128099865966$ | $9095120158392$ | $645753437426494$ | $45848500718449032$ | $3255243554430267150$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 418 curves (of which all are hyperelliptic):
- $y^2=60 x^6+46 x^5+19 x^4+47 x^3+20 x^2+16 x+29$
- $y^2=65 x^6+38 x^5+62 x^4+45 x^3+69 x^2+41 x+61$
- $y^2=36 x^6+18 x^5+61 x^4+25 x^3+36 x^2+23 x+22$
- $y^2=39 x^6+55 x^5+x^4+33 x^3+39 x^2+19 x+12$
- $y^2=10 x^6+18 x^5+38 x^4+60 x^3+3 x^2+68 x+40$
- $y^2=70 x^6+55 x^5+53 x^4+65 x^3+21 x^2+50 x+67$
- $y^2=3 x^6+44 x^5+69 x^4+19 x^2+10 x+60$
- $y^2=52 x^6+64 x^5+70 x^4+3 x^3+64 x^2+52 x+35$
- $y^2=9 x^6+22 x^5+64 x^4+21 x^3+22 x^2+9 x+32$
- $y^2=69 x^6+6 x^5+32 x^4+70 x^3+28 x^2+3 x+18$
- $y^2=57 x^6+42 x^5+11 x^4+64 x^3+54 x^2+21 x+55$
- $y^2=56 x^6+47 x^5+70 x^4+22 x^3+18 x^2+68 x+66$
- $y^2=23 x^6+58 x^5+43 x^4+16 x^3+46 x^2+37 x+58$
- $y^2=54 x^6+40 x^5+58 x^4+30 x^3+45 x^2+59 x+52$
- $y^2=23 x^6+67 x^5+51 x^4+68 x^3+31 x^2+58 x+9$
- $y^2=45 x^6+51 x^5+24 x^4+6 x^3+35 x^2+4 x+34$
- $y^2=31 x^6+2 x^5+26 x^4+42 x^3+32 x^2+28 x+25$
- $y^2=13 x^6+58 x^4+x^3+25 x^2+22 x+8$
- $y^2=20 x^6+51 x^4+7 x^3+33 x^2+12 x+56$
- $y^2=58 x^6+3 x^5+35 x^4+48 x^3+60 x^2+55 x+25$
- and 398 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 \(\Q(\sqrt{2}, \sqrt{-39})\). |
| The base change of $A$ to $\F_{71^{2}}$ is 1.5041.o 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-78}) \)$)$ |
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_ao | $4$ | (not in LMFDB) |
| 2.71.aq_ey | $8$ | (not in LMFDB) |
| 2.71.q_ey | $8$ | (not in LMFDB) |