Invariants
| Base field: | $\F_{41}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 10 x + 41 x^{2} )( 1 + 6 x + 41 x^{2} )$ |
| $1 - 4 x + 22 x^{2} - 164 x^{3} + 1681 x^{4}$ | |
| Frobenius angles: | $\pm0.214776712523$, $\pm0.655213070720$ |
| Angle rank: | $2$ (numerical) |
| Jacobians: | $215$ |
| 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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $1536$ | $2875392$ | $4729996800$ | $7997040230400$ | $13426700434515456$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $38$ | $1710$ | $68630$ | $2830046$ | $115891078$ | $4750054542$ | $194754501238$ | $7984925750206$ | $327381864699110$ | $13422659140741230$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 215 curves (of which all are hyperelliptic):
- $y^2=23 x^6+29 x^5+27 x^4+12 x^3+4 x^2+35 x+5$
- $y^2=30 x^6+34 x^5+29 x^4+25 x^3+31 x^2+30 x+16$
- $y^2=15 x^6+11 x^5+3 x^4+29 x+4$
- $y^2=31 x^6+15 x^5+24 x^4+15 x^3+3 x^2+36 x+23$
- $y^2=37 x^6+x^5+18 x^4+8 x^3+17 x^2+16 x+11$
- $y^2=3 x^6+11 x^5+5 x^4+31 x^3+11 x^2+28 x+2$
- $y^2=7 x^6+4 x^5+8 x^4+5 x^3+14 x^2+39 x+5$
- $y^2=30 x^6+28 x^4+33 x^3+7 x^2+2 x+33$
- $y^2=20 x^6+12 x^5+13 x^4+35 x^3+13 x^2+12 x+20$
- $y^2=38 x^6+33 x^5+8 x^4+12 x^3+33 x^2+19 x+32$
- $y^2=10 x^6+39 x^5+39 x^4+22 x^3+7 x^2+23 x+3$
- $y^2=15 x^6+4 x^5+6 x^4+33 x^2+9 x+36$
- $y^2=17 x^6+19 x^5+33 x^4+15 x^3+26 x^2+39 x+17$
- $y^2=16 x^6+26 x^5+27 x^4+28 x^3+11 x^2+24 x+33$
- $y^2=18 x^6+6 x^5+21 x^4+15 x^3+33 x^2+20 x+10$
- $y^2=5 x^6+32 x^5+11 x^4+14 x^3+3 x^2+14 x+25$
- $y^2=7 x^6+29 x^5+15 x^4+20 x^3+17 x^2+33 x+27$
- $y^2=34 x^6+6 x^5+4 x^4+13 x^3+16 x^2+33 x+17$
- $y^2=26 x^6+35 x^4+38 x^3+20 x^2+5 x+30$
- $y^2=18 x^6+40 x^5+x^4+29 x^3+28 x^2+5 x+37$
- and 195 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.g 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.