Invariants
| Base field: | $\F_{47}$ |
| Dimension: | $2$ |
| L-polynomial: | $( 1 - 8 x + 47 x^{2} )( 1 + 47 x^{2} )$ |
| $1 - 8 x + 94 x^{2} - 376 x^{3} + 2209 x^{4}$ | |
| Frobenius angles: | $\pm0.301698511018$, $\pm0.5$ |
| Angle rank: | $1$ (numerical) |
| Jacobians: | $270$ |
| Cyclic group of points: | no |
| Non-cyclic primes: | $2$ |
This isogeny class is not simple, primitive, not ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.
Newton polygon
| $p$-rank: | $1$ |
| Slopes: | $[0, 1/2, 1/2, 1]$ |
Point counts
Point counts of the abelian variety
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $1920$ | $5160960$ | $10843378560$ | $23806889164800$ | $52598947383753600$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $40$ | $2334$ | $104440$ | $4878782$ | $229344200$ | $10779251166$ | $506621783960$ | $23811274285438$ | $1119130514982760$ | $52599133152557214$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 270 curves (of which all are hyperelliptic):
- $y^2=30 x^6+41 x^5+6 x^4+23 x^2+12 x+30$
- $y^2=22 x^6+26 x^5+23 x^4+46 x^3+14 x^2+3 x+32$
- $y^2=32 x^5+41 x^4+41 x^3+46 x^2+19 x+15$
- $y^2=17 x^6+24 x^5+29 x^4+9 x^3+28 x^2+44 x+28$
- $y^2=25 x^6+20 x^5+44 x^4+32 x^3+39 x^2+20 x+3$
- $y^2=19 x^6+21 x^5+x^4+23 x^3+28 x^2+14 x+10$
- $y^2=36 x^6+x^5+35 x^4+43 x^3+35 x^2+x+36$
- $y^2=26 x^6+6 x^5+38 x^4+8 x^3+38 x^2+6 x+26$
- $y^2=11 x^6+23 x^5+43 x^4+25 x^3+43 x^2+23 x+11$
- $y^2=46 x^6+12 x^5+28 x^4+43 x^3+3 x^2+21 x+38$
- $y^2=21 x^6+30 x^5+15 x^4+3 x^3+15 x^2+30 x+21$
- $y^2=46 x^5+42 x^4+42 x^3+31 x^2+39 x+29$
- $y^2=39 x^6+15 x^5+x^4+28 x^3+42 x^2+13 x+21$
- $y^2=24 x^6+15 x^5+25 x^4+3 x^3+8 x^2+35 x+1$
- $y^2=4 x^5+42 x^4+22 x^3+42 x^2+4 x$
- $y^2=36 x^6+26 x^5+22 x^4+10 x^2+39 x+35$
- $y^2=41 x^6+33 x^5+30 x^4+2 x^3+17 x^2+34 x+28$
- $y^2=3 x^6+41 x^4+35 x^3+39 x^2+28$
- $y^2=29 x^6+36 x^5+44 x^4+3 x^3+44 x^2+36 x+29$
- $y^2=14 x^6+9 x^5+12 x^4+8 x^3+28 x^2+2 x+9$
- and 250 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{47^{2}}$.
Endomorphism algebra over $\F_{47}$| The isogeny class factors as 1.47.ai $\times$ 1.47.a 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 $\F_{47^{2}}$ is 1.2209.be $\times$ 1.2209.dq. The endomorphism algebra for each factor is:
|
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 |
|---|---|---|
| 2.47.i_dq | $2$ | (not in LMFDB) |