Invariants
| Base field: | $\F_{97}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 8 x + 97 x^{2} )( 1 + 18 x + 97 x^{2} )$ |
| $1 + 10 x + 50 x^{2} + 970 x^{3} + 9409 x^{4}$ | |
| Frobenius angles: | $\pm0.366875061252$, $\pm0.866875061252$ |
| Angle rank: | $1$ (numerical) |
| Jacobians: | $418$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2, 3$ |
This isogeny class is not 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $10440$ | $88531200$ | $835174453320$ | $7837773373440000$ | $73740240553766416200$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $108$ | $9410$ | $915084$ | $88533118$ | $8587087308$ | $832972004930$ | $80798270729004$ | $7837433941136638$ | $760231058254430508$ | $73742412689492826050$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 418 curves (of which all are hyperelliptic):
- $y^2=74 x^6+73 x^5+42 x^4+35 x^3+68 x^2+27 x+5$
- $y^2=31 x^6+34 x^5+13 x^4+95 x^3+51 x^2+79 x+15$
- $y^2=58 x^6+38 x^5+47 x^4+71 x^3+17 x^2+78 x+56$
- $y^2=45 x^6+9 x^5+74 x^4+48 x^3+10 x^2+16 x+60$
- $y^2=8 x^6+80 x^5+49 x^4+63 x^3+90 x^2+73 x+77$
- $y^2=83 x^6+18 x^5+20 x^4+29 x^3+86 x^2+6 x+15$
- $y^2=26 x^6+2 x^5+94 x^4+x^3+27 x^2+89 x+2$
- $y^2=2 x^6+24 x^5+38 x^4+94 x^3+60 x^2+10 x+19$
- $y^2=67 x^6+49 x^5+55 x^4+22 x^3+72 x^2+33 x+23$
- $y^2=52 x^6+5 x^5+75 x^4+75 x^2+5 x+52$
- $y^2=80 x^6+11 x^5+2 x^4+44 x^3+46 x^2+79 x+68$
- $y^2=15 x^6+77 x^5+85 x^4+67 x^3+6 x^2+48 x+96$
- $y^2=74 x^6+30 x^5+70 x^4+16 x^3+56 x^2+74 x+56$
- $y^2=45 x^6+52 x^5+63 x^4+33 x^3+38 x^2+38 x+21$
- $y^2=3 x^6+51 x^5+62 x^4+28 x^3+12 x^2+87 x+54$
- $y^2=11 x^6+13 x^5+20 x^4+85 x^3+6 x^2+61 x+84$
- $y^2=60 x^6+35 x^5+94 x^4+58 x^3+47 x^2+91 x+93$
- $y^2=3 x^6+87 x^5+69 x^4+49 x^3+69 x^2+87 x+3$
- $y^2=15 x^6+73 x^5+88 x^4+49 x^3+64 x^2+4 x$
- $y^2=50 x^6+56 x^5+37 x^4+6 x^3+x^2+90 x+49$
- and 398 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{97^{4}}$.
Endomorphism algebra over $\F_{97}$| The isogeny class factors as 1.97.ai $\times$ 1.97.s and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is: |
| The base change of $A$ to $\F_{97^{4}}$ is 1.88529281.cvu 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-1}) \)$)$ |
- Endomorphism algebra over $\F_{97^{2}}$
The base change of $A$ to $\F_{97^{2}}$ is 1.9409.afa $\times$ 1.9409.fa. The endomorphism algebra for each factor is:
Base change
This is a primitive isogeny class.