Invariants
| Base field: | $\F_{71}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 16 x + 71 x^{2} )( 1 + 71 x^{2} )$ |
| $1 - 16 x + 142 x^{2} - 1136 x^{3} + 5041 x^{4}$ | |
| Frobenius angles: | $\pm0.101666819831$, $\pm0.5$ |
| Angle rank: | $1$ (numerical) |
| Jacobians: | $238$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
This isogeny class is not simple, primitive, not ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.
Newton polygon
| $p$-rank: | $1$ |
| Slopes: | $[0, 1/2, 1/2, 1]$ |
Point counts
Point counts of the abelian variety
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $4032$ | $25546752$ | $127854756288$ | $645423361228800$ | $3255247567224418752$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $56$ | $5070$ | $357224$ | $25398686$ | $1804231576$ | $128101242222$ | $9095123880136$ | $645753522754366$ | $45848501131516664$ | $3255243558221852430$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 238 curves (of which all are hyperelliptic):
- $y^2=55 x^6+13 x^5+53 x^4+49 x^3+40 x^2+64 x+25$
- $y^2=38 x^6+69 x^5+38 x^4+15 x^3+52 x^2+x+59$
- $y^2=53 x^6+41 x^5+18 x^4+51 x^3+34 x^2+7 x+36$
- $y^2=9 x^5+24 x^4+x^3+14 x^2+9 x+2$
- $y^2=23 x^6+3 x^5+48 x^4+14 x^3+2 x^2+27 x+53$
- $y^2=38 x^6+51 x^5+31 x^4+2 x^3+31 x^2+51 x+38$
- $y^2=58 x^6+51 x^5+22 x^4+38 x^3+53 x^2+67 x+6$
- $y^2=65 x^6+4 x^5+10 x^4+31 x^3+10 x^2+4 x+65$
- $y^2=30 x^6+x^5+44 x^4+32 x^3+31 x^2+19 x+7$
- $y^2=26 x^6+14 x^5+30 x^4+62 x^3+52 x^2+11 x+35$
- $y^2=65 x^6+48 x^5+15 x^4+10 x^3+70 x^2+50 x+57$
- $y^2=17 x^6+23 x^5+37 x^4+38 x^3+59 x^2+5 x+32$
- $y^2=39 x^6+14 x^5+53 x^4+39 x^3+8 x^2+15 x+56$
- $y^2=69 x^6+45 x^5+58 x^4+39 x^3+48 x^2+6 x+13$
- $y^2=48 x^6+47 x^5+39 x^4+23 x^3+39 x^2+47 x+48$
- $y^2=4 x^6+15 x^5+42 x^4+11 x^3+50 x^2+24 x+22$
- $y^2=5 x^6+11 x^5+65 x^4+8 x^3+13 x^2+12 x+7$
- $y^2=55 x^6+25 x^5+60 x^4+24 x^3+10 x^2+9 x+66$
- $y^2=70 x^6+55 x^5+17 x^4+58 x^2+26 x+63$
- $y^2=59 x^6+3 x^5+33 x^4+29 x^3+50 x^2+26 x+10$
- and 218 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{71^{2}}$.
Endomorphism algebra over $\F_{71}$| The isogeny class factors as 1.71.aq $\times$ 1.71.a and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is: |
The base change of $A$ to $\F_{71^{2}}$ is 1.5041.aek $\times$ 1.5041.fm. 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.q_fm | $2$ | (not in LMFDB) |