Invariants
| Base field: | $\F_{83}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 8 x + 150 x^{2} + 664 x^{3} + 6889 x^{4}$ |
| Frobenius angles: | $\pm0.471015506635$, $\pm0.677803852112$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-7 +4 \sqrt{2}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $432$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
This isogeny class is simple and 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $7712$ | $49110016$ | $326314223648$ | $2252083970686976$ | $15515992695248572192$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $92$ | $7126$ | $570692$ | $47453934$ | $3939028332$ | $326940232006$ | $27136064431316$ | $2252292184214238$ | $186940253813368700$ | $15516041198076523446$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 432 curves (of which all are hyperelliptic):
- $y^2=5 x^6+47 x^5+48 x^4+63 x^3+77 x^2+77 x+23$
- $y^2=53 x^6+78 x^5+24 x^4+9 x^3+44 x^2+81 x+36$
- $y^2=15 x^6+41 x^5+29 x^4+77 x^3+69 x^2+57 x+78$
- $y^2=16 x^6+78 x^5+36 x^4+72 x^3+74 x^2+6 x+33$
- $y^2=x^6+68 x^5+x^4+13 x^3+58 x^2+49 x+57$
- $y^2=46 x^6+x^5+37 x^4+72 x^3+65 x^2+12 x+76$
- $y^2=44 x^6+18 x^5+53 x^4+41 x^3+32 x^2+77 x+46$
- $y^2=38 x^6+20 x^5+17 x^4+9 x^3+12 x^2+70 x+51$
- $y^2=4 x^6+63 x^5+26 x^4+x^3+69 x^2+51 x+5$
- $y^2=5 x^6+39 x^5+24 x^4+12 x^3+73 x^2+24 x+9$
- $y^2=2 x^6+56 x^5+x^4+32 x^3+33 x^2+14 x+9$
- $y^2=80 x^6+12 x^5+64 x^4+13 x^3+37 x^2+56 x+7$
- $y^2=7 x^6+58 x^5+18 x^4+15 x^3+50 x^2+18 x+29$
- $y^2=57 x^6+46 x^5+19 x^4+16 x^3+78 x^2+4 x+56$
- $y^2=16 x^6+61 x^5+26 x^4+40 x^3+24 x^2+56 x+33$
- $y^2=24 x^6+77 x^5+21 x^4+43 x^3+39 x^2+30 x+49$
- $y^2=5 x^6+79 x^5+58 x^4+20 x^3+34 x^2+22 x+57$
- $y^2=65 x^6+3 x^5+27 x^4+38 x^3+42 x^2+71 x$
- $y^2=3 x^6+27 x^5+8 x^4+37 x^3+26 x^2+21 x+74$
- $y^2=16 x^6+67 x^5+20 x^4+53 x^3+15 x^2+77 x+63$
- and 412 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{83}$.
Endomorphism algebra over $\F_{83}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-7 +4 \sqrt{2}})\). |
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.ai_fu | $2$ | (not in LMFDB) |