Properties

Label 2.79.a_dq
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:  $( 1 - 8 x + 79 x^{2} )( 1 + 8 x + 79 x^{2} )$
  $1 + 94 x^{2} + 6241 x^{4}$
Frobenius angles:  $\pm0.351411445414$, $\pm0.648588554586$
Angle rank:  $1$ (numerical)
Jacobians:  $805$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6336$ $40144896$ $243086526144$ $1517392925097984$ $9468276082354051776$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $80$ $6430$ $493040$ $38957374$ $3077056400$ $243085596766$ $19203908986160$ $1517108939120254$ $119851595982618320$ $9468276082081256350$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 805 curves (of which all are hyperelliptic):

  • $y^2=6 x^6+10 x^5+75 x^4+46 x^3+21 x^2+44 x+11$
  • $y^2=18 x^6+30 x^5+67 x^4+59 x^3+63 x^2+53 x+33$
  • $y^2=24 x^6+49 x^5+45 x^4+37 x^3+32 x^2+30 x+38$
  • $y^2=72 x^6+68 x^5+56 x^4+32 x^3+17 x^2+11 x+35$
  • $y^2=55 x^6+78 x^5+46 x^4+7 x^3+23 x^2+66 x+68$
  • $y^2=2 x^6+70 x^5+43 x^4+19 x^3+45 x^2+78 x+1$
  • $y^2=6 x^6+52 x^5+50 x^4+57 x^3+56 x^2+76 x+3$
  • $y^2=70 x^6+9 x^5+68 x^4+72 x^3+x^2+51 x+19$
  • $y^2=59 x^6+58 x^5+37 x^4+48 x^3+37 x^2+58 x+59$
  • $y^2=19 x^6+16 x^5+32 x^4+65 x^3+32 x^2+16 x+19$
  • $y^2=44 x^6+27 x^5+3 x^4+58 x^3+27 x^2+54 x+2$
  • $y^2=53 x^6+2 x^5+9 x^4+16 x^3+2 x^2+4 x+6$
  • $y^2=30 x^6+47 x^5+34 x^4+29 x^3+78 x^2+63 x+51$
  • $y^2=11 x^6+62 x^5+23 x^4+8 x^3+76 x^2+31 x+74$
  • $y^2=30 x^6+71 x^5+68 x^4+44 x^3+64 x^2+46 x+4$
  • $y^2=11 x^6+55 x^5+46 x^4+53 x^3+34 x^2+59 x+12$
  • $y^2=32 x^6+8 x^5+27 x^4+72 x^3+13 x^2+40 x+39$
  • $y^2=78 x^6+33 x^5+14 x^4+6 x^3+71 x^2+10 x+53$
  • $y^2=76 x^6+20 x^5+42 x^4+18 x^3+55 x^2+30 x+1$
  • $y^2=29 x^6+31 x^5+56 x^4+66 x^3+22 x^2+4 x+47$
  • and 785 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{79^{2}}$.

Endomorphism algebra over $\F_{79}$
The isogeny class factors as 1.79.ai $\times$ 1.79.i and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:
Endomorphism algebra over $\overline{\F}_{79}$
The base change of $A$ to $\F_{79^{2}}$ is 1.6241.dq 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-7}) \)$)$

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.aq_io$2$(not in LMFDB)
2.79.q_io$2$(not in LMFDB)
2.79.a_adq$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.79.aq_io$2$(not in LMFDB)
2.79.q_io$2$(not in LMFDB)
2.79.a_adq$4$(not in LMFDB)
2.79.ai_ap$6$(not in LMFDB)
2.79.i_ap$6$(not in LMFDB)