Properties

Label 2.79.ak_dy
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

Related objects

Downloads

Learn more

Invariants

Base field:  $\F_{79}$
Dimension:  $2$
L-polynomial:  $( 1 - 14 x + 79 x^{2} )( 1 + 4 x + 79 x^{2} )$
  $1 - 10 x + 102 x^{2} - 790 x^{3} + 6241 x^{4}$
Frobenius angles:  $\pm0.211343260462$, $\pm0.572243955238$
Angle rank:  $2$ (numerical)
Jacobians:  $616$
Cyclic group of points:    no
Non-cyclic primes:   $2, 3$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5544$ $39606336$ $242935091784$ $1517239519488000$ $9468921512341040904$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $70$ $6346$ $492730$ $38953438$ $3077266150$ $243088316746$ $19203900789850$ $1517108784856318$ $119851595939456710$ $9468276072900372106$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 616 curves (of which all are hyperelliptic):

  • $y^2=75 x^6+24 x^5+53 x^4+47 x^3+53 x^2+15 x+32$
  • $y^2=42 x^6+6 x^5+65 x^4+50 x^3+23 x^2+3 x+39$
  • $y^2=38 x^6+17 x^5+20 x^4+39 x^3+20 x^2+17 x+38$
  • $y^2=14 x^6+26 x^5+63 x^4+32 x^3+63 x^2+25 x+17$
  • $y^2=63 x^6+39 x^5+6 x^4+45 x^3+55 x^2+21 x+73$
  • $y^2=21 x^6+47 x^5+28 x^4+53 x^3+24 x^2+54 x+38$
  • $y^2=5 x^6+50 x^5+6 x^4+19 x^3+6 x^2+50 x+5$
  • $y^2=47 x^6+21 x^5+67 x^4+60 x^3+30 x^2+54 x+72$
  • $y^2=4 x^6+35 x^5+39 x^4+49 x^3+54 x^2+31 x+21$
  • $y^2=34 x^6+37 x^5+23 x^4+12 x^3+49 x^2+15 x+23$
  • $y^2=76 x^6+36 x^5+70 x^4+5 x^3+30 x^2+20 x+69$
  • $y^2=6 x^6+25 x^5+19 x^4+70 x^3+60 x^2+52 x+68$
  • $y^2=34 x^6+8 x^5+42 x^4+48 x^3+40 x^2+9 x+35$
  • $y^2=13 x^5+77 x^4+69 x^3+53 x^2+75 x+14$
  • $y^2=46 x^6+53 x^5+6 x^4+29 x^3+6 x^2+53 x+46$
  • $y^2=3 x^6+3 x^5+49 x^4+3 x^3+61 x^2+78 x+52$
  • $y^2=53 x^6+6 x^5+50 x^4+39 x^3+8 x^2+51 x+52$
  • $y^2=73 x^6+16 x^5+68 x^4+69 x^3+29 x^2+76 x+51$
  • $y^2=15 x^6+69 x^5+7 x^4+22 x^3+21 x^2+68 x+77$
  • $y^2=57 x^6+59 x^5+33 x^4+78 x^3+58 x^2+74 x+42$
  • and 596 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.ao $\times$ 1.79.e 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 are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.79.as_ig$2$(not in LMFDB)
2.79.k_dy$2$(not in LMFDB)
2.79.s_ig$2$(not in LMFDB)
2.79.abf_pg$3$(not in LMFDB)
2.79.ab_ay$3$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.79.as_ig$2$(not in LMFDB)
2.79.k_dy$2$(not in LMFDB)
2.79.s_ig$2$(not in LMFDB)
2.79.abf_pg$3$(not in LMFDB)
2.79.ab_ay$3$(not in LMFDB)
2.79.abb_nc$6$(not in LMFDB)
2.79.ad_adc$6$(not in LMFDB)
2.79.b_ay$6$(not in LMFDB)
2.79.d_adc$6$(not in LMFDB)
2.79.bb_nc$6$(not in LMFDB)
2.79.bf_pg$6$(not in LMFDB)