Invariants
| Base field: | $\F_{83}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 38 x^{2} + 6889 x^{4}$ |
| Frobenius angles: | $\pm0.213240998089$, $\pm0.786759001911$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{-2}, \sqrt{51})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $224$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $6852$ | $46949904$ | $326941103844$ | $2253463181070336$ | $15516041179999603332$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $84$ | $6814$ | $571788$ | $47482990$ | $3939040644$ | $326941834318$ | $27136050989628$ | $2252292117717214$ | $186940255267540404$ | $15516041172793353214$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 224 curves (of which all are hyperelliptic):
- $y^2=79 x^6+82 x^5+x^4+7 x^3+46 x^2+60 x+32$
- $y^2=75 x^6+81 x^5+2 x^4+14 x^3+9 x^2+37 x+64$
- $y^2=13 x^6+44 x^5+19 x^4+14 x^3+52 x^2+75 x+22$
- $y^2=26 x^6+5 x^5+38 x^4+28 x^3+21 x^2+67 x+44$
- $y^2=39 x^6+4 x^5+9 x^4+59 x^3+63 x^2+8 x+76$
- $y^2=6 x^6+7 x^5+68 x^4+39 x^3+49 x^2+40 x+47$
- $y^2=12 x^6+14 x^5+53 x^4+78 x^3+15 x^2+80 x+11$
- $y^2=10 x^6+59 x^5+39 x^4+9 x^3+38 x^2+40 x+16$
- $y^2=20 x^6+35 x^5+78 x^4+18 x^3+76 x^2+80 x+32$
- $y^2=60 x^6+x^5+43 x^4+10 x^3+24 x^2+51 x+54$
- $y^2=37 x^6+2 x^5+3 x^4+20 x^3+48 x^2+19 x+25$
- $y^2=63 x^6+14 x^5+81 x^4+4 x^3+16 x^2+50 x+82$
- $y^2=43 x^6+28 x^5+79 x^4+8 x^3+32 x^2+17 x+81$
- $y^2=71 x^6+41 x^4+8 x^3+42 x^2+34 x+11$
- $y^2=59 x^6+82 x^4+16 x^3+x^2+68 x+22$
- $y^2=80 x^6+5 x^5+73 x^4+34 x^3+61 x^2+29 x+68$
- $y^2=37 x^6+2 x^5+56 x^4+28 x^3+68 x^2+58 x+52$
- $y^2=34 x^6+33 x^5+36 x^4+29 x^3+18 x^2+24 x+11$
- $y^2=68 x^6+66 x^5+72 x^4+58 x^3+36 x^2+48 x+22$
- $y^2=55 x^6+22 x^5+31 x^4+5 x^2+25 x+46$
- and 204 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 \(\Q(\sqrt{-2}, \sqrt{51})\). |
| The base change of $A$ to $\F_{83^{2}}$ is 1.6889.abm 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-102}) \)$)$ |
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_bm | $4$ | (not in LMFDB) |
| 2.83.aq_ey | $8$ | (not in LMFDB) |
| 2.83.q_ey | $8$ | (not in LMFDB) |