Invariants
| Base field: | $\F_{83}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 16 x + 83 x^{2} )( 1 + 16 x + 83 x^{2} )$ |
| $1 - 90 x^{2} + 6889 x^{4}$ | |
| Frobenius angles: | $\pm0.158801688027$, $\pm0.841198311973$ |
| Angle rank: | $1$ (numerical) |
| Jacobians: | $329$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $6800$ | $46240000$ | $326941504400$ | $2252831296000000$ | $15516041185055114000$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $84$ | $6710$ | $571788$ | $47469678$ | $3939040644$ | $326942635430$ | $27136050989628$ | $2252292357492958$ | $186940255267540404$ | $15516041182904374550$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 329 curves (of which all are hyperelliptic):
- $y^2=81 x^6+48 x^5+21 x^4+17 x^3+35 x^2+35 x+50$
- $y^2=5 x^6+25 x^5+18 x^4+38 x^3+73 x^2+69 x+73$
- $y^2=10 x^6+50 x^5+36 x^4+76 x^3+63 x^2+55 x+63$
- $y^2=26 x^6+60 x^5+41 x^4+15 x^3+18 x^2+72 x+72$
- $y^2=45 x^6+45 x^5+5 x^4+39 x^3+35 x^2+57 x+80$
- $y^2=7 x^6+7 x^5+10 x^4+78 x^3+70 x^2+31 x+77$
- $y^2=56 x^6+57 x^5+59 x^4+30 x^3+15 x^2+17 x+41$
- $y^2=29 x^6+31 x^5+35 x^4+60 x^3+30 x^2+34 x+82$
- $y^2=56 x^6+51 x^5+11 x^4+13 x^3+14 x^2+26 x+22$
- $y^2=29 x^6+19 x^5+22 x^4+26 x^3+28 x^2+52 x+44$
- $y^2=66 x^6+46 x^5+65 x^4+18 x^3+64 x^2+20 x+76$
- $y^2=49 x^6+9 x^5+47 x^4+36 x^3+45 x^2+40 x+69$
- $y^2=57 x^6+32 x^5+4 x^4+50 x^3+69 x+72$
- $y^2=31 x^6+64 x^5+8 x^4+17 x^3+55 x+61$
- $y^2=49 x^6+30 x^5+5 x^4+46 x^3+6 x^2+3 x+18$
- $y^2=15 x^6+60 x^5+10 x^4+9 x^3+12 x^2+6 x+36$
- $y^2=43 x^6+28 x^5+39 x^4+69 x^3+50 x^2+40 x+66$
- $y^2=48 x^6+19 x^5+18 x^4+4 x^3+77 x^2+54 x+26$
- $y^2=66 x^6+28 x^5+22 x^4+72 x^3+39 x^2+35 x+20$
- $y^2=49 x^6+56 x^5+44 x^4+61 x^3+78 x^2+70 x+40$
- and 309 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{83^{2}}$.
Endomorphism algebra over $\F_{83}$| The isogeny class factors as 1.83.aq $\times$ 1.83.q 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 $\F_{83^{2}}$ is 1.6889.adm 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-19}) \)$)$ |
Base change
This is a primitive isogeny class.