Invariants
| Base field: | $\F_{41}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 10 x + 41 x^{2} )( 1 + 2 x + 41 x^{2} )$ |
| $1 - 8 x + 62 x^{2} - 328 x^{3} + 1681 x^{4}$ | |
| Frobenius angles: | $\pm0.214776712523$, $\pm0.549915982954$ |
| Angle rank: | $2$ (numerical) |
| Jacobians: | $224$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $1408$ | $2928640$ | $4749635968$ | $7985815552000$ | $13426848293761408$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $34$ | $1742$ | $68914$ | $2826078$ | $115892354$ | $4750270382$ | $194753478674$ | $7984919893438$ | $327381934733794$ | $13422659103573902$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 224 curves (of which all are hyperelliptic):
- $y^2=36 x^6+6 x^5+28 x^4+31 x^3+40 x^2+25 x+19$
- $y^2=21 x^6+20 x^5+8 x^4+18 x^3+18 x^2+2 x+24$
- $y^2=5 x^6+21 x^5+12 x^4+15 x^3+30 x^2+14 x+11$
- $y^2=27 x^6+26 x^5+12 x^4+7 x^3+28 x^2+36 x+14$
- $y^2=14 x^6+36 x^5+27 x^4+39 x^3+8 x^2+35 x+27$
- $y^2=31 x^6+28 x^5+38 x^4+17 x^3+11 x^2+5 x+40$
- $y^2=13 x^6+15 x^5+4 x^4+16 x^3+22 x^2+13 x+28$
- $y^2=3 x^6+12 x^5+25 x^4+26 x^3+x+13$
- $y^2=17 x^6+27 x^5+12 x^4+25 x^3+22 x^2+15 x+1$
- $y^2=x^6+14 x^5+15 x^4+10 x^3+20 x^2+18 x+20$
- $y^2=29 x^6+24 x^5+16 x^4+11 x^3+33 x^2+x+10$
- $y^2=18 x^6+22 x^5+x^3+37 x^2+34 x+24$
- $y^2=38 x^6+8 x^5+8 x^4+8 x^3+28 x^2+6 x+11$
- $y^2=28 x^6+4 x^5+8 x^4+11 x^3+8 x^2+4 x+28$
- $y^2=12 x^6+9 x^5+17 x^4+14 x^3+7 x^2+17 x+10$
- $y^2=5 x^6+2 x^5+23 x^4+4 x^3+4 x^2+17 x+33$
- $y^2=26 x^6+34 x^5+x^4+26 x^3+3 x^2+39 x+34$
- $y^2=8 x^6+32 x^5+16 x^4+7 x^3+12 x^2+32 x+30$
- $y^2=22 x^6+23 x^5+14 x^4+7 x^3+31 x^2+34 x+11$
- $y^2=30 x^6+14 x^5+34 x^4+37 x^3+28 x^2+19 x+7$
- and 204 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{41}$.
Endomorphism algebra over $\F_{41}$| The isogeny class factors as 1.41.ak $\times$ 1.41.c and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is: |
Base change
This is a primitive isogeny class.