Properties

Label 2.79.ai_gc
Base field $\F_{79}$
Dimension $2$
$p$-rank $1$
Ordinary no
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:  $( 1 - 8 x + 79 x^{2} )( 1 + 79 x^{2} )$
  $1 - 8 x + 158 x^{2} - 632 x^{3} + 6241 x^{4}$
Frobenius angles:  $\pm0.351411445414$, $\pm0.5$
Angle rank:  $1$ (numerical)
Jacobians:  $450$
Cyclic group of points:    no
Non-cyclic primes:   $2, 3$

This isogeny class is not simple, primitive, not ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

$p$-rank:  $1$
Slopes:  $[0, 1/2, 1/2, 1]$

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5760$ $40550400$ $243770808960$ $1516764679372800$ $9468029407323484800$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $72$ $6494$ $494424$ $38941246$ $3076976232$ $243087512222$ $19203907884408$ $1517108796613246$ $119851596586511496$ $9468276088508164574$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 450 curves (of which all are hyperelliptic):

  • $y^2=55 x^6+27 x^5+64 x^4+44 x^3+13 x^2+74 x+2$
  • $y^2=8 x^6+18 x^5+77 x^4+11 x^3+77 x^2+18 x+8$
  • $y^2=39 x^6+21 x^5+21 x^4+75 x^3+49 x^2+53 x+34$
  • $y^2=2 x^6+64 x^5+23 x^4+49 x^3+54 x^2+37$
  • $y^2=12 x^6+28 x^5+14 x^4+58 x^3+8 x^2+x+68$
  • $y^2=7 x^6+57 x^5+10 x^4+32 x^3+29 x^2+29 x$
  • $y^2=39 x^6+58 x^5+64 x^4+72 x^3+2 x^2+7 x+7$
  • $y^2=27 x^6+22 x^5+10 x^4+29 x^3+10 x^2+22 x+27$
  • $y^2=23 x^6+30 x^5+55 x^4+21 x^3+9 x^2+56 x+1$
  • $y^2=56 x^6+27 x^5+22 x^4+17 x^3+29 x^2+11 x+72$
  • $y^2=31 x^6+70 x^5+34 x^4+24 x^3+71 x^2+26 x+67$
  • $y^2=26 x^6+45 x^5+13 x^4+19 x^3+5 x^2+52 x+70$
  • $y^2=18 x^6+63 x^5+58 x^4+49 x^3+46 x^2+9 x+20$
  • $y^2=9 x^6+36 x^5+50 x^4+48 x^3+18 x^2+x+23$
  • $y^2=13 x^6+58 x^5+64 x^4+51 x^3+64 x^2+58 x+13$
  • $y^2=17 x^6+16 x^5+35 x^4+28 x^3+17 x^2+76 x+31$
  • $y^2=61 x^6+51 x^5+40 x^4+48 x^3+50 x^2+55 x+71$
  • $y^2=24 x^6+32 x^5+29 x^4+49 x^3+29 x^2+32 x+24$
  • $y^2=41 x^6+50 x^4+24 x^3+27 x^2+2 x+9$
  • $y^2=64 x^6+70 x^5+61 x^4+69 x^3+61 x^2+70 x+64$
  • and 430 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.a 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 $\times$ 1.6241.gc. 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.i_gc$2$(not in LMFDB)