Invariants
| Base field: | $\F_{83}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 68 x^{2} + 6889 x^{4}$ |
| Frobenius angles: | $\pm0.317172587130$, $\pm0.682827412870$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{2}, \sqrt{-13})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $343$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $7$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $6958$ | $48413764$ | $326939282446$ | $2253161277810576$ | $15516041193965005918$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $84$ | $7026$ | $571788$ | $47476630$ | $3939040644$ | $326938191522$ | $27136050989628$ | $2252292254380894$ | $186940255267540404$ | $15516041200724158386$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 343 curves (of which all are hyperelliptic):
- $y^2=20 x^6+30 x^5+21 x^4+72 x^3+78 x^2+18 x+52$
- $y^2=40 x^6+60 x^5+42 x^4+61 x^3+73 x^2+36 x+21$
- $y^2=28 x^6+26 x^5+81 x^4+59 x^3+37 x^2+74 x+24$
- $y^2=56 x^6+52 x^5+79 x^4+35 x^3+74 x^2+65 x+48$
- $y^2=52 x^6+24 x^5+38 x^4+48 x^3+75 x^2+47 x+63$
- $y^2=21 x^6+48 x^5+76 x^4+13 x^3+67 x^2+11 x+43$
- $y^2=45 x^6+38 x^5+63 x^4+43 x^3+30 x^2+75 x+70$
- $y^2=7 x^6+76 x^5+43 x^4+3 x^3+60 x^2+67 x+57$
- $y^2=80 x^6+28 x^5+19 x^4+42 x^3+21 x^2+64 x+47$
- $y^2=77 x^6+56 x^5+38 x^4+x^3+42 x^2+45 x+11$
- $y^2=25 x^6+67 x^5+30 x^4+36 x^3+47 x^2+74 x+60$
- $y^2=50 x^6+51 x^5+60 x^4+72 x^3+11 x^2+65 x+37$
- $y^2=37 x^6+60 x^5+4 x^4+77 x^3+61 x^2+10 x+7$
- $y^2=74 x^6+37 x^5+8 x^4+71 x^3+39 x^2+20 x+14$
- $y^2=13 x^6+23 x^5+39 x^4+23 x^3+35 x^2+56 x+21$
- $y^2=26 x^6+46 x^5+78 x^4+46 x^3+70 x^2+29 x+42$
- $y^2=61 x^6+32 x^5+x^4+66 x^3+61 x^2+44 x+14$
- $y^2=39 x^6+64 x^5+2 x^4+49 x^3+39 x^2+5 x+28$
- $y^2=14 x^6+3 x^5+56 x^4+38 x^3+43 x^2+6 x+23$
- $y^2=28 x^6+6 x^5+29 x^4+76 x^3+3 x^2+12 x+46$
- and 323 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 \(\Q(\sqrt{2}, \sqrt{-13})\). |
| The base change of $A$ to $\F_{83^{2}}$ is 1.6889.cq 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-13}) \)$)$ |
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_acq | $4$ | (not in LMFDB) |
| 2.83.ao_du | $8$ | (not in LMFDB) |
| 2.83.o_du | $8$ | (not in LMFDB) |