Invariants
| Base field: | $\F_{83}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 70 x^{2} + 6889 x^{4}$ |
| Frobenius angles: | $\pm0.180719097892$, $\pm0.819280902108$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{-6}, \sqrt{59})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $440$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $6820$ | $46512400$ | $326941477060$ | $2253135075840000$ | $15516041180729376100$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $84$ | $6750$ | $571788$ | $47476078$ | $3939040644$ | $326942580750$ | $27136050989628$ | $2252292264334558$ | $186940255267540404$ | $15516041174252898750$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 440 curves (of which all are hyperelliptic):
- $y^2=38 x^6+36 x^5+42 x^4+4 x^3+30 x^2+78 x+4$
- $y^2=76 x^6+72 x^5+x^4+8 x^3+60 x^2+73 x+8$
- $y^2=52 x^6+18 x^5+34 x^4+73 x^3+44 x^2+2 x+78$
- $y^2=38 x^6+42 x^5+80 x^4+66 x^3+74 x^2+26 x+17$
- $y^2=76 x^6+x^5+77 x^4+49 x^3+65 x^2+52 x+34$
- $y^2=35 x^6+80 x^5+21 x^4+61 x^3+35 x^2+67 x+13$
- $y^2=79 x^6+38 x^5+51 x^4+5 x^3+7 x^2+81 x+23$
- $y^2=75 x^6+76 x^5+19 x^4+10 x^3+14 x^2+79 x+46$
- $y^2=31 x^6+37 x^5+23 x^4+34 x^3+15 x^2+49 x+6$
- $y^2=47 x^6+6 x^5+71 x^4+69 x^3+39 x^2+10 x+64$
- $y^2=11 x^6+12 x^5+59 x^4+55 x^3+78 x^2+20 x+45$
- $y^2=74 x^6+34 x^5+10 x^4+11 x^3+54 x^2+22 x+11$
- $y^2=65 x^6+68 x^5+20 x^4+22 x^3+25 x^2+44 x+22$
- $y^2=30 x^6+9 x^5+53 x^4+66 x^3+56 x^2+50 x+31$
- $y^2=60 x^6+18 x^5+23 x^4+49 x^3+29 x^2+17 x+62$
- $y^2=68 x^6+6 x^5+68 x^4+14 x^3+31 x+22$
- $y^2=53 x^6+12 x^5+53 x^4+28 x^3+62 x+44$
- $y^2=52 x^6+52 x^5+46 x^4+61 x^3+33 x^2+69 x+40$
- $y^2=21 x^6+21 x^5+9 x^4+39 x^3+66 x^2+55 x+80$
- $y^2=8 x^6+2 x^5+52 x^4+80 x^3+42 x^2+69 x+33$
- and 420 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{83^{2}}$.
Endomorphism algebra over $\F_{83}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-6}, \sqrt{59})\). |
| The base change of $A$ to $\F_{83^{2}}$ is 1.6889.acs 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-354}) \)$)$ |
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 |
|---|---|---|
| 2.83.a_cs | $4$ | (not in LMFDB) |