Properties

Label 2.79.am_gn
Base field $\F_{79}$
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:  $\F_{79}$
Dimension:  $2$
L-polynomial:  $( 1 - 11 x + 79 x^{2} )( 1 - x + 79 x^{2} )$
  $1 - 12 x + 169 x^{2} - 948 x^{3} + 6241 x^{4}$
Frobenius angles:  $\pm0.287619798331$, $\pm0.482084212174$
Angle rank:  $2$ (numerical)
Jacobians:  $312$
Cyclic group of points:    yes

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5451$ $40179321$ $243834219216$ $1517067699208425$ $9468247249947822171$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $68$ $6436$ $494552$ $38949028$ $3077047028$ $243087743806$ $19203903593852$ $1517108694172228$ $119851595836890248$ $9468276093526124356$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 312 curves (of which all are hyperelliptic):

  • $y^2=28 x^6+29 x^5+16 x^4+77 x^3+13 x^2+36 x+44$
  • $y^2=63 x^6+30 x^5+54 x^4+59 x^3+66 x^2+10 x+19$
  • $y^2=12 x^6+40 x^5+56 x^4+x^3+26 x^2+36 x+27$
  • $y^2=76 x^6+68 x^5+21 x^4+33 x^3+69 x^2+43 x+77$
  • $y^2=75 x^6+47 x^5+71 x^4+19 x^3+53 x^2+40 x+51$
  • $y^2=75 x^6+28 x^5+64 x^4+60 x^3+32 x^2+7 x+39$
  • $y^2=13 x^6+17 x^5+26 x^4+25 x^3+42 x^2+65 x+46$
  • $y^2=41 x^6+54 x^5+70 x^4+54 x^3+44 x^2+50 x+13$
  • $y^2=39 x^6+39 x^5+31 x^4+42 x^3+65 x^2+35 x+53$
  • $y^2=36 x^6+33 x^5+57 x^4+40 x^3+44 x^2+78 x+68$
  • $y^2=40 x^6+33 x^5+47 x^4+68 x^3+14 x^2+56 x+11$
  • $y^2=58 x^6+27 x^5+32 x^4+4 x^3+55 x^2+11 x+76$
  • $y^2=44 x^6+44 x^5+47 x^4+43 x^3+74 x^2+59 x+34$
  • $y^2=23 x^6+17 x^5+17 x^4+62 x^3+36 x^2+15 x+73$
  • $y^2=63 x^6+19 x^5+28 x^4+68 x^3+18 x^2+73 x+74$
  • $y^2=58 x^6+35 x^5+29 x^4+25 x^3+53 x^2+31 x+5$
  • $y^2=22 x^6+11 x^5+30 x^4+19 x^3+58 x^2+4 x+2$
  • $y^2=77 x^6+64 x^5+47 x^4+22 x^3+35 x^2+42 x+63$
  • $y^2=75 x^6+9 x^5+53 x^4+8 x^3+34 x^2+21 x+75$
  • $y^2=10 x^6+13 x^5+34 x^4+59 x^3+31 x^2+20 x+29$
  • and 292 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{79}$.

Endomorphism algebra over $\F_{79}$
The isogeny class factors as 1.79.al $\times$ 1.79.ab 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
2.79.ak_fr$2$(not in LMFDB)
2.79.k_fr$2$(not in LMFDB)
2.79.m_gn$2$(not in LMFDB)