Properties

Label 2.79.a_adu
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:  $( 1 - 16 x + 79 x^{2} )( 1 + 16 x + 79 x^{2} )$
  $1 - 98 x^{2} + 6241 x^{4}$
Frobenius angles:  $\pm0.143514932644$, $\pm0.856485067356$
Angle rank:  $1$ (numerical)
Jacobians:  $230$
Cyclic group of points:    no
Non-cyclic primes:   $2$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6144$ $37748736$ $243088349184$ $1517333092761600$ $9468276083871995904$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $80$ $6046$ $493040$ $38955838$ $3077056400$ $243089242846$ $19203908986160$ $1517108949141118$ $119851595982618320$ $9468276085117144606$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 230 curves (of which all are hyperelliptic):

  • $y^2=64 x^6+9 x^5+32 x^4+75 x^3+75 x^2+67 x+15$
  • $y^2=16 x^6+42 x^5+63 x^4+64 x^3+6 x^2+31 x+49$
  • $y^2=48 x^6+47 x^5+31 x^4+34 x^3+18 x^2+14 x+68$
  • $y^2=17 x^6+35 x^5+x^4+33 x^3+63 x^2+58 x+57$
  • $y^2=51 x^6+26 x^5+3 x^4+20 x^3+31 x^2+16 x+13$
  • $y^2=35 x^6+34 x^5+44 x^4+43 x^3+31 x^2+15 x+63$
  • $y^2=26 x^6+23 x^5+53 x^4+50 x^3+14 x^2+45 x+31$
  • $y^2=65 x^6+54 x^5+26 x^4+38 x^3+59 x^2+39 x+63$
  • $y^2=37 x^6+4 x^5+78 x^4+35 x^3+19 x^2+38 x+31$
  • $y^2=8 x^6+56 x^5+24 x^4+22 x^3+77 x^2+16 x+43$
  • $y^2=33 x^6+33 x^5+37 x^4+23 x^3+50 x^2+7 x+18$
  • $y^2=72 x^6+19 x^5+29 x^4+19 x^3+42 x^2+55 x+48$
  • $y^2=58 x^6+57 x^5+8 x^4+57 x^3+47 x^2+7 x+65$
  • $y^2=19 x^6+4 x^5+16 x^4+15 x^3+12 x^2+6 x+30$
  • $y^2=57 x^6+12 x^5+48 x^4+45 x^3+36 x^2+18 x+11$
  • $y^2=35 x^6+33 x^5+4 x^4+7 x^3+35 x^2+57 x+2$
  • $y^2=26 x^6+20 x^5+12 x^4+21 x^3+26 x^2+13 x+6$
  • $y^2=29 x^6+49 x^5+52 x^4+45 x^3+21 x^2+2 x+38$
  • $y^2=8 x^6+68 x^5+77 x^4+56 x^3+63 x^2+6 x+35$
  • $y^2=35 x^6+49 x^5+16 x^4+42 x^3+52 x^2+9 x+35$
  • and 210 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.aq $\times$ 1.79.q 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.adu 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-15}) \)$)$

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.abg_py$2$(not in LMFDB)
2.79.bg_py$2$(not in LMFDB)
2.79.a_du$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.79.abg_py$2$(not in LMFDB)
2.79.bg_py$2$(not in LMFDB)
2.79.a_du$4$(not in LMFDB)
2.79.aq_gv$6$(not in LMFDB)
2.79.q_gv$6$(not in LMFDB)