Properties

Label 2.79.i_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:  $( 1 + 79 x^{2} )( 1 + 8 x + 79 x^{2} )$
  $1 + 8 x + 158 x^{2} + 632 x^{3} + 6241 x^{4}$
Frobenius angles:  $\pm0.5$, $\pm0.648588554586$
Angle rank:  $1$ (numerical)
Jacobians:  $450$
Cyclic group of points:    no
Non-cyclic primes:   $2$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $7040$ $40550400$ $242406074240$ $1516764679372800$ $9468522770238435200$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $88$ $6494$ $491656$ $38941246$ $3077136568$ $243087512222$ $19203910087912$ $1517108796613246$ $119851595378725144$ $9468276088508164574$

Jacobians and polarizations

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

  • $y^2=71 x^6+9 x^5+74 x^4+41 x^3+57 x^2+51 x+27$
  • $y^2=29 x^6+6 x^5+52 x^4+30 x^3+52 x^2+6 x+29$
  • $y^2=38 x^6+63 x^5+63 x^4+67 x^3+68 x^2+x+23$
  • $y^2=6 x^6+34 x^5+69 x^4+68 x^3+4 x^2+32$
  • $y^2=4 x^6+62 x^5+31 x^4+72 x^3+29 x^2+53 x+49$
  • $y^2=21 x^6+13 x^5+30 x^4+17 x^3+8 x^2+8 x$
  • $y^2=38 x^6+16 x^5+34 x^4+58 x^3+6 x^2+21 x+21$
  • $y^2=9 x^6+60 x^5+56 x^4+36 x^3+56 x^2+60 x+9$
  • $y^2=69 x^6+11 x^5+7 x^4+63 x^3+27 x^2+10 x+3$
  • $y^2=45 x^6+9 x^5+60 x^4+32 x^3+36 x^2+30 x+24$
  • $y^2=14 x^6+52 x^5+23 x^4+72 x^3+55 x^2+78 x+43$
  • $y^2=35 x^6+15 x^5+57 x^4+59 x^3+28 x^2+70 x+76$
  • $y^2=54 x^6+31 x^5+16 x^4+68 x^3+59 x^2+27 x+60$
  • $y^2=3 x^6+12 x^5+43 x^4+16 x^3+6 x^2+53 x+34$
  • $y^2=39 x^6+16 x^5+34 x^4+74 x^3+34 x^2+16 x+39$
  • $y^2=32 x^6+58 x^5+38 x^4+62 x^3+32 x^2+78 x+63$
  • $y^2=73 x^6+17 x^5+66 x^4+16 x^3+43 x^2+71 x+50$
  • $y^2=8 x^6+37 x^5+36 x^4+69 x^3+36 x^2+37 x+8$
  • $y^2=44 x^6+71 x^4+72 x^3+2 x^2+6 x+27$
  • $y^2=34 x^6+52 x^5+25 x^4+49 x^3+25 x^2+52 x+34$
  • 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.a $\times$ 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 $\times$ 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.ai_gc$2$(not in LMFDB)