Properties

Label 2.83.ad_er
Base field $\F_{83}$
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:  $\F_{83}$
Dimension:  $2$
L-polynomial:  $1 - 3 x + 121 x^{2} - 249 x^{3} + 6889 x^{4}$
Frobenius angles:  $\pm0.348001574503$, $\pm0.595296025549$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-1130 +18 \sqrt{21}})\)
Galois group:  $D_{4}$
Jacobians:  $224$
Cyclic group of points:    no
Non-cyclic primes:   $3$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6759$ $49090617$ $327119858289$ $2252271469814109$ $15516195799550604624$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $81$ $7123$ $572103$ $47457883$ $3939079896$ $326939017543$ $27136039893309$ $2252292375703171$ $186940256432879439$ $15516041179907919718$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 224 curves (of which all are hyperelliptic):

  • $y^2=52 x^6+67 x^5+31 x^4+7 x^3+15 x^2+51 x+35$
  • $y^2=54 x^6+53 x^5+71 x^4+10 x^3+69 x^2+69 x+64$
  • $y^2=46 x^6+77 x^5+21 x^4+61 x^3+63 x^2+64 x+74$
  • $y^2=22 x^6+2 x^5+66 x^4+9 x^3+26 x^2+52 x+54$
  • $y^2=66 x^6+57 x^5+82 x^4+63 x^3+52 x^2+38 x+46$
  • $y^2=13 x^6+25 x^5+53 x^4+16 x^3+75 x^2+22 x+31$
  • $y^2=28 x^6+69 x^5+76 x^4+65 x^3+21 x^2+74 x+81$
  • $y^2=61 x^6+44 x^5+46 x^4+21 x^3+19 x^2+x+57$
  • $y^2=10 x^6+40 x^5+67 x^4+32 x^3+30 x^2+38 x+41$
  • $y^2=35 x^6+27 x^4+54 x^3+73 x^2+55 x+48$
  • $y^2=2 x^6+42 x^5+55 x^4+63 x^3+32 x^2+30 x+65$
  • $y^2=44 x^6+12 x^5+40 x^4+8 x^3+23 x^2+62 x+16$
  • $y^2=51 x^6+50 x^5+79 x^4+36 x^3+63 x^2+72 x+36$
  • $y^2=18 x^6+8 x^5+x^4+80 x^3+18 x^2+31 x+79$
  • $y^2=51 x^6+50 x^5+8 x^4+23 x^3+32 x^2+67 x+58$
  • $y^2=16 x^6+52 x^5+82 x^4+44 x^3+16 x^2+48 x+22$
  • $y^2=73 x^6+21 x^5+44 x^4+57 x^3+78 x^2+56 x+16$
  • $y^2=52 x^6+9 x^5+65 x^4+19 x^3+24 x^2+4 x+79$
  • $y^2=65 x^6+39 x^5+5 x^4+79 x^3+38 x^2+26 x+21$
  • $y^2=2 x^6+45 x^5+60 x^4+68 x^3+73 x^2+16 x+74$
  • and 204 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{83}$.

Endomorphism algebra over $\F_{83}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-1130 +18 \sqrt{21}})\).

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.83.d_er$2$(not in LMFDB)