Invariants
| Base field: | $\F_{71}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 3 x + 71 x^{2} )( 1 + 12 x + 71 x^{2} )$ |
| $1 + 9 x + 106 x^{2} + 639 x^{3} + 5041 x^{4}$ | |
| Frobenius angles: | $\pm0.443031714434$, $\pm0.752241693036$ |
| Angle rank: | $2$ (numerical) |
| Jacobians: | $280$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $5796$ | $26082000$ | $128023184016$ | $645816297672000$ | $3255011857799461116$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $81$ | $5173$ | $357696$ | $25414153$ | $1804100931$ | $128100655438$ | $9095129937261$ | $645753473459953$ | $45848500611932736$ | $3255243549972314173$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 280 curves (of which all are hyperelliptic):
- $y^2=60 x^6+23 x^5+61 x^4+26 x^3+44 x^2+68 x+36$
- $y^2=2 x^6+53 x^5+7 x^4+60 x^3+41 x^2+2 x+49$
- $y^2=20 x^6+7 x^5+63 x^4+x^3+67 x^2+x+3$
- $y^2=69 x^6+13 x^5+44 x^4+70 x^3+48 x+53$
- $y^2=27 x^6+14 x^5+22 x^4+8 x^3+47 x^2+36 x+33$
- $y^2=67 x^6+44 x^5+40 x^4+19 x^3+42 x^2+22 x+58$
- $y^2=40 x^5+16 x^4+51 x^3+31 x^2+61$
- $y^2=70 x^6+28 x^5+55 x^4+21 x^3+48 x^2+9 x+1$
- $y^2=11 x^6+15 x^5+49 x^4+11 x^3+48 x^2+58 x+39$
- $y^2=60 x^6+59 x^5+9 x^4+58 x^3+7 x^2+28 x+59$
- $y^2=2 x^6+27 x^5+6 x^4+42 x^3+38 x^2+37 x+4$
- $y^2=23 x^6+6 x^5+15 x^4+63 x^3+44 x^2+56 x+32$
- $y^2=37 x^6+51 x^5+60 x^4+37 x^3+26 x^2+48 x+67$
- $y^2=52 x^5+34 x^4+44 x^3+8 x^2+21 x+28$
- $y^2=25 x^6+35 x^5+25 x^4+20 x^3+2 x^2+30 x+60$
- $y^2=58 x^6+18 x^5+24 x^4+70 x^3+23 x^2+61 x+67$
- $y^2=25 x^6+18 x^5+24 x^4+39 x^3+37 x^2+55 x+67$
- $y^2=27 x^6+13 x^5+35 x^4+45 x^3+x^2+54 x+37$
- $y^2=67 x^6+5 x^5+12 x^4+57 x^3+66 x^2+34 x+4$
- $y^2=45 x^6+9 x^5+4 x^4+25 x^3+4 x^2+19 x+6$
- and 260 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.ad $\times$ 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.ap_gw | $2$ | (not in LMFDB) |
| 2.71.aj_ec | $2$ | (not in LMFDB) |
| 2.71.p_gw | $2$ | (not in LMFDB) |