Invariants
| Base field: | $\F_{71}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 15 x + 71 x^{2} )( 1 + 12 x + 71 x^{2} )$ |
| $1 - 3 x - 38 x^{2} - 213 x^{3} + 5041 x^{4}$ | |
| Frobenius angles: | $\pm0.150643965450$, $\pm0.752241693036$ |
| Angle rank: | $2$ (numerical) |
| Jacobians: | $312$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2, 3$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $4788$ | $24993360$ | $127740373488$ | $646090852680000$ | $3255240893217674508$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $69$ | $4957$ | $356904$ | $25424953$ | $1804227879$ | $128100997582$ | $9095130151449$ | $645753521131153$ | $45848501227276344$ | $3255243550682969077$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 312 curves (of which all are hyperelliptic):
- $y^2=36 x^6+49 x^5+62 x^4+6 x^3+41 x^2+33 x+22$
- $y^2=58 x^6+55 x^5+29 x^4+4 x^3+34 x^2+52 x+43$
- $y^2=29 x^6+63 x^5+60 x^4+49 x^3+47 x^2+49 x+20$
- $y^2=28 x^6+63 x^5+60 x^4+63 x^3+33 x^2+25 x+7$
- $y^2=2 x^6+43 x^5+x^4+57 x^3+45 x^2+59 x+3$
- $y^2=57 x^6+46 x^5+66 x^4+44 x^3+34 x^2+12 x+8$
- $y^2=6 x^6+38 x^5+65 x^4+36 x^3+19 x^2+19 x+39$
- $y^2=57 x^6+5 x^5+7 x^4+56 x^3+69 x^2+50 x+17$
- $y^2=50 x^6+45 x^5+15 x^4+10 x^3+68 x^2+65 x+40$
- $y^2=32 x^6+8 x^5+44 x^4+48 x^3+43 x^2+32 x+43$
- $y^2=69 x^6+62 x^5+34 x^4+63 x^3+11 x^2+37 x+25$
- $y^2=21 x^6+10 x^5+31 x^4+48 x^3+53 x^2+49 x+27$
- $y^2=44 x^6+25 x^5+64 x^4+2 x^3+5 x^2+12 x+49$
- $y^2=60 x^6+26 x^5+25 x^4+29 x^3+47 x^2+27 x+36$
- $y^2=40 x^6+17 x^5+61 x^4+67 x^3+21 x^2+12$
- $y^2=4 x^6+69 x^5+68 x^4+18 x^3+69 x^2+15 x+66$
- $y^2=9 x^6+25 x^5+5 x^4+16 x^3+10 x^2+49 x+3$
- $y^2=43 x^6+70 x^5+27 x^4+67 x^3+37 x^2+11 x+14$
- $y^2=26 x^6+55 x^5+6 x^4+27 x^3+46 x^2+65 x+32$
- $y^2=5 x^6+15 x^5+22 x^4+69 x^3+26 x^2+65 x+40$
- and 292 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.ap $\times$ 1.71.m 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.abb_mk | $2$ | (not in LMFDB) |
| 2.71.d_abm | $2$ | (not in LMFDB) |
| 2.71.bb_mk | $2$ | (not in LMFDB) |