Invariants
| Base field: | $\F_{83}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 4 x - 30 x^{2} - 332 x^{3} + 6889 x^{4}$ |
| Frobenius angles: | $\pm0.153531632256$, $\pm0.732159800000$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-16 +5 \sqrt{2}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $210$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $6524$ | $46946704$ | $326129808284$ | $2253159360628736$ | $15516170374178384764$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $80$ | $6814$ | $570368$ | $47476590$ | $3939073440$ | $326941104718$ | $27136070746256$ | $2252292218146014$ | $186940255821143024$ | $15516041190521417214$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 210 curves (of which all are hyperelliptic):
- $y^2=5 x^6+37 x^5+63 x^4+27 x^3+74 x^2+34 x+53$
- $y^2=79 x^6+50 x^5+76 x^4+80 x^3+13 x^2+75 x+54$
- $y^2=79 x^6+73 x^5+65 x^4+69 x^3+22 x^2+44 x+61$
- $y^2=71 x^6+63 x^5+12 x^4+57 x^3+77 x^2+31 x+56$
- $y^2=72 x^6+14 x^5+66 x^3+10 x^2+77 x+58$
- $y^2=80 x^6+77 x^5+52 x^4+64 x^3+79 x^2+30 x+11$
- $y^2=50 x^6+52 x^5+62 x^4+37 x^3+25 x^2+65 x+81$
- $y^2=58 x^6+72 x^5+66 x^4+43 x^3+31 x^2+73 x+12$
- $y^2=42 x^6+54 x^5+64 x^4+19 x^3+24 x^2+45 x+2$
- $y^2=67 x^6+47 x^5+49 x^4+69 x^3+66 x^2+75 x$
- $y^2=48 x^5+74 x^4+65 x^3+8 x^2+63 x+70$
- $y^2=8 x^6+9 x^5+x^4+21 x^3+9 x^2+77 x+6$
- $y^2=21 x^6+59 x^5+35 x^4+24 x^3+11 x^2+67 x+53$
- $y^2=45 x^6+22 x^5+63 x^4+31 x^3+64 x^2+30 x+56$
- $y^2=64 x^6+17 x^5+33 x^4+39 x^3+59 x^2+18 x+32$
- $y^2=41 x^6+43 x^5+50 x^4+2 x^3+12 x^2+44 x$
- $y^2=6 x^6+36 x^5+70 x^4+34 x^3+66 x^2+48 x+21$
- $y^2=75 x^6+41 x^5+7 x^4+4 x^3+28 x^2+27 x+82$
- $y^2=31 x^6+33 x^5+11 x^4+48 x^3+31 x^2+55 x+7$
- $y^2=17 x^6+29 x^5+32 x^4+3 x^3+72 x^2+26 x+43$
- and 190 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 \(\Q(\sqrt{-16 +5 \sqrt{2}})\). |
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.e_abe | $2$ | (not in LMFDB) |