Invariants
| Base field: | $\F_{71}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 114 x^{2} + 5041 x^{4}$ |
| Frobenius angles: | $\pm0.398333180169$, $\pm0.601666819831$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(i, \sqrt{7})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $241$ |
| Isomorphism classes: | 162 |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $5156$ | $26584336$ | $128100041444$ | $645605491277824$ | $3255243547406368676$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $72$ | $5270$ | $357912$ | $25405854$ | $1804229352$ | $128099798966$ | $9095120158392$ | $645753615909694$ | $45848500718449032$ | $3255243543802856150$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 241 curves (of which all are hyperelliptic):
- $y^2=15 x^6+66 x^5+16 x^4+55 x^3+25 x^2+36 x+20$
- $y^2=34 x^6+36 x^5+41 x^4+30 x^3+33 x^2+39 x+69$
- $y^2=49 x^6+29 x^5+50 x^4+66 x^3+67 x^2+37 x+50$
- $y^2=59 x^6+61 x^5+66 x^4+36 x^3+43 x^2+46 x+66$
- $y^2=13 x^6+8 x^5+40 x^4+57 x^3+67 x^2+55 x+62$
- $y^2=20 x^6+56 x^5+67 x^4+44 x^3+43 x^2+30 x+8$
- $y^2=70 x^6+30 x^5+53 x^4+15 x^3+63 x^2+63 x+17$
- $y^2=64 x^6+68 x^5+16 x^4+34 x^3+15 x^2+15 x+48$
- $y^2=10 x^6+30 x^5+26 x^4+10 x^3+29 x^2+64 x+42$
- $y^2=68 x^6+47 x^5+20 x^4+2 x^3+28 x^2+6 x+58$
- $y^2=50 x^6+45 x^5+69 x^4+14 x^3+54 x^2+42 x+51$
- $y^2=19 x^6+31 x^5+19 x^4+11 x^3+55 x^2+9 x+50$
- $y^2=62 x^6+4 x^5+62 x^4+6 x^3+30 x^2+63 x+66$
- $y^2=21 x^6+3 x^5+28 x^4+52 x^3+38 x^2+16 x+2$
- $y^2=5 x^6+21 x^5+54 x^4+9 x^3+53 x^2+41 x+14$
- $y^2=24 x^6+62 x^5+51 x^4+68 x^3+18 x^2+11 x+3$
- $y^2=26 x^6+8 x^5+2 x^4+50 x^3+55 x^2+6 x+21$
- $y^2=67 x^6+31 x^5+44 x^4+35 x^3+x^2+39 x+18$
- $y^2=48 x^6+68 x^5+37 x^4+44 x^3+28 x^2+39 x+67$
- $y^2=52 x^6+50 x^5+46 x^4+24 x^3+54 x^2+60 x+43$
- and 221 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 \(\Q(i, \sqrt{7})\). |
| The base change of $A$ to $\F_{71^{2}}$ is 1.5041.ek 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-7}) \)$)$ |
Base change
This is a primitive isogeny class.