Properties

Label 2.47.c_bu
Base field $\F_{47}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple no
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{47}$
Dimension:  $2$
L-polynomial:  $( 1 - 6 x + 47 x^{2} )( 1 + 8 x + 47 x^{2} )$
  $1 + 2 x + 46 x^{2} + 94 x^{3} + 2209 x^{4}$
Frobenius angles:  $\pm0.355830380849$, $\pm0.698301488982$
Angle rank:  $2$ (numerical)
Jacobians:  $252$
Cyclic group of points:    no
Non-cyclic primes:   $2, 7$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $2352$ $5080320$ $10780488432$ $23833610035200$ $52593977458615152$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $50$ $2298$ $103838$ $4884254$ $229322530$ $10778854266$ $506624415886$ $23811292693246$ $1119130485044306$ $52599132610319418$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 252 curves (of which all are hyperelliptic):

  • $y^2=8 x^6+5 x^5+10 x^4+15 x^3+41 x^2+22 x+15$
  • $y^2=35 x^6+15 x^5+8 x^4+21 x^3+32 x^2+34 x+21$
  • $y^2=32 x^5+6 x^4+43 x^3+27 x^2+9 x+12$
  • $y^2=33 x^6+23 x^5+19 x^4+23 x^3+34 x^2+40 x+9$
  • $y^2=36 x^6+4 x^5+37 x^4+26 x^3+37 x^2+4 x+36$
  • $y^2=37 x^6+23 x^5+3 x^4+46 x^2+17 x+8$
  • $y^2=44 x^6+15 x^5+42 x^4+23 x^3+9 x^2+31 x+43$
  • $y^2=19 x^6+8 x^5+25 x^4+18 x^3+44 x^2+22 x+40$
  • $y^2=27 x^6+37 x^5+14 x^4+24 x^3+24 x^2+20 x+19$
  • $y^2=11 x^6+19 x^5+22 x^4+13 x^3+33 x^2+29 x+20$
  • $y^2=24 x^6+12 x^5+26 x^4+29 x^3+41 x^2+24 x+7$
  • $y^2=8 x^6+19 x^5+35 x^4+16 x^3+36 x^2+20 x+31$
  • $y^2=12 x^6+22 x^5+37 x^4+34 x^3+34 x^2+35 x+41$
  • $y^2=25 x^6+19 x^5+2 x^4+24 x^3+2 x^2+3 x+27$
  • $y^2=9 x^6+22 x^5+43 x^4+32 x^3+13 x^2+19 x+46$
  • $y^2=20 x^6+32 x^5+16 x^4+40 x^3+37 x^2+x+4$
  • $y^2=9 x^6+30 x^5+41 x^4+15 x^3+44 x^2+44 x+43$
  • $y^2=28 x^6+10 x^5+39 x^4+21 x^3+18 x^2+8 x+5$
  • $y^2=27 x^6+39 x^5+28 x^4+12 x^3+8 x^2+27 x+11$
  • $y^2=8 x^5+24 x^4+14 x^3+17 x^2+3 x+5$
  • and 232 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{47}$.

Endomorphism algebra over $\F_{47}$
The isogeny class factors as 1.47.ag $\times$ 1.47.i 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.

Twists

Below is a list of all twists of this isogeny class.

TwistExtension degreeCommon base change
2.47.ao_fm$2$(not in LMFDB)
2.47.ac_bu$2$(not in LMFDB)
2.47.o_fm$2$(not in LMFDB)