Invariants
| Base field: | $\F_{83}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 + 54 x^{2} + 6889 x^{4}$ |
| Frobenius angles: | $\pm0.302732845514$, $\pm0.697267154486$ |
| Angle rank: | $1$ (numerical) |
| Number field: | \(\Q(\sqrt{7}, \sqrt{-55})\) |
| Galois group: | $C_2^2$ |
| Jacobians: | $356$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $6944$ | $48219136$ | $326939414816$ | $2253323429625856$ | $15516041195054917664$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $84$ | $6998$ | $571788$ | $47480046$ | $3939040644$ | $326938456262$ | $27136050989628$ | $2252292186006238$ | $186940255267540404$ | $15516041202903981878$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 356 curves (of which all are hyperelliptic):
- $y^2=30 x^6+17 x^5+47 x^4+37 x^3+74 x^2+15 x+34$
- $y^2=34 x^6+62 x^5+12 x^4+2 x^3+51 x^2+46 x+38$
- $y^2=68 x^6+41 x^5+24 x^4+4 x^3+19 x^2+9 x+76$
- $y^2=2 x^6+44 x^5+44 x^4+8 x^3+9 x^2+70 x+67$
- $y^2=4 x^6+5 x^5+5 x^4+16 x^3+18 x^2+57 x+51$
- $y^2=3 x^5+78 x^4+66 x^3+38 x^2+17 x+14$
- $y^2=6 x^5+73 x^4+49 x^3+76 x^2+34 x+28$
- $y^2=42 x^6+71 x^5+27 x^4+20 x^3+3 x^2+19 x+68$
- $y^2=x^6+59 x^5+54 x^4+40 x^3+6 x^2+38 x+53$
- $y^2=5 x^6+52 x^5+14 x^4+9 x^3+44 x^2+28 x+17$
- $y^2=10 x^6+21 x^5+28 x^4+18 x^3+5 x^2+56 x+34$
- $y^2=57 x^6+71 x^5+53 x^4+58 x^3+57 x^2+52 x+4$
- $y^2=31 x^6+59 x^5+23 x^4+33 x^3+31 x^2+21 x+8$
- $y^2=82 x^6+22 x^5+36 x^4+50 x^3+32 x^2+33 x+18$
- $y^2=8 x^6+48 x^5+65 x^4+64 x^3+79 x^2+43 x+30$
- $y^2=75 x^6+54 x^5+24 x^4+62 x^2+60 x+57$
- $y^2=67 x^6+25 x^5+48 x^4+41 x^2+37 x+31$
- $y^2=73 x^6+15 x^5+36 x^4+22 x^3+54 x^2+19 x+78$
- $y^2=63 x^6+30 x^5+72 x^4+44 x^3+25 x^2+38 x+73$
- $y^2=53 x^6+61 x^5+64 x^4+27 x^3+8 x^2+35$
- and 336 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 \(\Q(\sqrt{7}, \sqrt{-55})\). |
| The base change of $A$ to $\F_{83^{2}}$ is 1.6889.cc 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-385}) \)$)$ |
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_acc | $4$ | (not in LMFDB) |