Properties

Label 2.83.ae_fq
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:  $1 - 4 x + 146 x^{2} - 332 x^{3} + 6889 x^{4}$
Frobenius angles:  $\pm0.376395054759$, $\pm0.550859926400$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-76 +2 \sqrt{6}})\)
Galois group:  $D_{4}$
Jacobians:  $168$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6700$ $49392400$ $327336225100$ $2251756050688000$ $15515934657145283500$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $80$ $7166$ $572480$ $47447022$ $3939013600$ $326940243374$ $27136045899280$ $2252292299624158$ $186940256423819120$ $15516041181183688286$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 168 curves (of which all are hyperelliptic):

  • $y^2=8 x^6+2 x^5+40 x^4+37 x^3+75 x^2+27 x+73$
  • $y^2=43 x^6+3 x^5+65 x^4+5 x^3+35 x^2+68 x+58$
  • $y^2=58 x^6+40 x^5+82 x^4+x^3+29 x^2+42 x+37$
  • $y^2=76 x^6+17 x^5+22 x^4+49 x^3+30 x^2+82 x+16$
  • $y^2=16 x^6+73 x^5+15 x^4+79 x^3+43 x^2+26$
  • $y^2=41 x^6+62 x^5+32 x^4+23 x^3+29 x^2+32 x+26$
  • $y^2=30 x^6+40 x^5+71 x^4+28 x^3+23 x^2+6 x+23$
  • $y^2=11 x^6+11 x^5+68 x^4+58 x^3+66 x^2+50 x+15$
  • $y^2=67 x^6+3 x^5+42 x^4+19 x^3+79 x^2+48 x+18$
  • $y^2=35 x^6+36 x^5+9 x^4+41 x^3+6 x^2+12 x+46$
  • $y^2=81 x^6+10 x^5+27 x^4+36 x^3+29 x^2+68 x+75$
  • $y^2=73 x^6+37 x^5+3 x^4+25 x^3+9 x^2+49 x+3$
  • $y^2=14 x^6+82 x^5+19 x^4+54 x^3+50 x^2+53 x+79$
  • $y^2=19 x^6+65 x^5+26 x^4+80 x^3+60 x^2+62 x+49$
  • $y^2=13 x^6+35 x^5+28 x^4+31 x^3+56 x^2+29 x+63$
  • $y^2=39 x^6+12 x^5+64 x^4+20 x^2+63 x+53$
  • $y^2=72 x^6+33 x^5+42 x^4+34 x^3+59 x^2+15 x+7$
  • $y^2=53 x^6+27 x^5+18 x^4+35 x^3+37 x^2+42 x+54$
  • $y^2=60 x^6+57 x^5+26 x^4+58 x^3+31 x^2+3 x+5$
  • $y^2=33 x^6+82 x^5+34 x^4+57 x^2+32 x+37$
  • and 148 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 \(\Q(\sqrt{-76 +2 \sqrt{6}})\).

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.e_fq$2$(not in LMFDB)