Properties

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

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Invariants

Base field:  $\F_{47}$
Dimension:  $2$
L-polynomial:  $1 + 12 x + 82 x^{2} + 564 x^{3} + 2209 x^{4}$
Frobenius angles:  $\pm0.478435144664$, $\pm0.891900187401$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-8 + \sqrt{3}})\)
Galois group:  $D_{4}$
Jacobians:  $150$
Cyclic group of points:    no
Non-cyclic primes:   $2$

This isogeny class is simple and geometrically 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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $2868$ $4921488$ $10828056564$ $23785984594944$ $52595943002830068$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $60$ $2230$ $104292$ $4874494$ $229331100$ $10779499510$ $506622742980$ $23811287193214$ $1119130368124284$ $52599133037140150$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 150 curves (of which all are hyperelliptic):

  • $y^2=26 x^6+34 x^5+40 x^4+22 x^3+5 x^2+2 x+36$
  • $y^2=4 x^6+7 x^5+36 x^4+20 x^3+43 x^2+10 x+18$
  • $y^2=6 x^6+42 x^5+43 x^4+35 x^3+40 x^2+31 x+14$
  • $y^2=32 x^6+35 x^5+46 x^4+24 x^3+46 x^2+11 x+12$
  • $y^2=3 x^6+30 x^5+39 x^4+14 x^3+26 x^2+26 x+24$
  • $y^2=32 x^6+26 x^5+10 x^4+41 x^3+4 x^2+15 x+23$
  • $y^2=39 x^6+17 x^5+21 x^4+36 x^2+3 x+25$
  • $y^2=46 x^6+19 x^5+8 x^4+12 x^3+13 x^2+11 x+3$
  • $y^2=46 x^6+42 x^5+x^4+4 x^3+35 x^2+35 x+38$
  • $y^2=3 x^6+42 x^5+3 x^3+15 x^2+41 x+6$
  • $y^2=21 x^6+31 x^5+x^4+19 x^3+12 x^2+8 x+41$
  • $y^2=13 x^6+32 x^5+34 x^4+29 x^3+46 x^2+43 x+28$
  • $y^2=9 x^6+44 x^5+36 x^4+33 x^3+25 x^2+14 x+12$
  • $y^2=25 x^6+38 x^5+20 x^4+26 x^3+25 x^2+18 x+2$
  • $y^2=40 x^6+16 x^3+25 x^2+12 x+35$
  • $y^2=5 x^6+23 x^5+40 x^4+4 x^3+43 x^2+32 x+15$
  • $y^2=28 x^6+9 x^5+10 x^4+5 x^3+22 x^2+45 x+9$
  • $y^2=24 x^6+42 x^5+17 x^4+31 x^3+37 x^2+17 x+19$
  • $y^2=16 x^6+10 x^5+14 x^4+31 x^3+39 x^2+36 x+13$
  • $y^2=34 x^6+36 x^5+12 x^4+36 x^3+16 x+42$
  • and 130 more

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{47}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-8 + \sqrt{3}})\).

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.am_de$2$(not in LMFDB)