Invariants
| Base field: | $\F_{83}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 3 x + 121 x^{2} - 249 x^{3} + 6889 x^{4}$ |
| Frobenius angles: | $\pm0.348001574503$, $\pm0.595296025549$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-1130 +18 \sqrt{21}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $224$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $3$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $6759$ | $49090617$ | $327119858289$ | $2252271469814109$ | $15516195799550604624$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $81$ | $7123$ | $572103$ | $47457883$ | $3939079896$ | $326939017543$ | $27136039893309$ | $2252292375703171$ | $186940256432879439$ | $15516041179907919718$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 224 curves (of which all are hyperelliptic):
- $y^2=52 x^6+67 x^5+31 x^4+7 x^3+15 x^2+51 x+35$
- $y^2=54 x^6+53 x^5+71 x^4+10 x^3+69 x^2+69 x+64$
- $y^2=46 x^6+77 x^5+21 x^4+61 x^3+63 x^2+64 x+74$
- $y^2=22 x^6+2 x^5+66 x^4+9 x^3+26 x^2+52 x+54$
- $y^2=66 x^6+57 x^5+82 x^4+63 x^3+52 x^2+38 x+46$
- $y^2=13 x^6+25 x^5+53 x^4+16 x^3+75 x^2+22 x+31$
- $y^2=28 x^6+69 x^5+76 x^4+65 x^3+21 x^2+74 x+81$
- $y^2=61 x^6+44 x^5+46 x^4+21 x^3+19 x^2+x+57$
- $y^2=10 x^6+40 x^5+67 x^4+32 x^3+30 x^2+38 x+41$
- $y^2=35 x^6+27 x^4+54 x^3+73 x^2+55 x+48$
- $y^2=2 x^6+42 x^5+55 x^4+63 x^3+32 x^2+30 x+65$
- $y^2=44 x^6+12 x^5+40 x^4+8 x^3+23 x^2+62 x+16$
- $y^2=51 x^6+50 x^5+79 x^4+36 x^3+63 x^2+72 x+36$
- $y^2=18 x^6+8 x^5+x^4+80 x^3+18 x^2+31 x+79$
- $y^2=51 x^6+50 x^5+8 x^4+23 x^3+32 x^2+67 x+58$
- $y^2=16 x^6+52 x^5+82 x^4+44 x^3+16 x^2+48 x+22$
- $y^2=73 x^6+21 x^5+44 x^4+57 x^3+78 x^2+56 x+16$
- $y^2=52 x^6+9 x^5+65 x^4+19 x^3+24 x^2+4 x+79$
- $y^2=65 x^6+39 x^5+5 x^4+79 x^3+38 x^2+26 x+21$
- $y^2=2 x^6+45 x^5+60 x^4+68 x^3+73 x^2+16 x+74$
- and 204 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 \(\Q(\sqrt{-1130 +18 \sqrt{21}})\). |
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.d_er | $2$ | (not in LMFDB) |