Properties

Label 2.79.e_abi
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:  $( 1 - 12 x + 79 x^{2} )( 1 + 16 x + 79 x^{2} )$
  $1 + 4 x - 34 x^{2} + 316 x^{3} + 6241 x^{4}$
Frobenius angles:  $\pm0.264120855861$, $\pm0.856485067356$
Angle rank:  $2$ (numerical)
Jacobians:  $292$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6528$ $38436864$ $243788897664$ $1517699562209280$ $9468242864727512448$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $84$ $6158$ $494460$ $38965246$ $3077045604$ $243088089806$ $19203892427916$ $1517108806478206$ $119851595300295540$ $9468276086513412878$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 292 curves (of which all are hyperelliptic):

  • $y^2=47 x^6+72 x^5+54 x^4+5 x^3+49 x^2+19 x+62$
  • $y^2=41 x^6+11 x^5+66 x^4+45 x^3+66 x^2+11 x+41$
  • $y^2=45 x^6+63 x^5+65 x^4+25 x^3+55 x^2+61 x+36$
  • $y^2=45 x^6+7 x^5+32 x^4+38 x^3+40 x^2+14 x+72$
  • $y^2=67 x^6+5 x^5+38 x^4+31 x^3+65 x^2+11 x+3$
  • $y^2=13 x^6+76 x^5+54 x^4+50 x^3+75 x^2+78 x+56$
  • $y^2=48 x^6+33 x^5+68 x^4+75 x^3+51 x^2+3 x+63$
  • $y^2=34 x^6+63 x^5+66 x^4+28 x^3+60 x^2+60 x+71$
  • $y^2=68 x^6+58 x^5+21 x^4+9 x^3+54 x^2+52 x+48$
  • $y^2=4 x^6+35 x^5+54 x^4+x^3+52 x^2+26 x+6$
  • $y^2=5 x^6+40 x^5+74 x^4+3 x^3+78 x^2+24 x+7$
  • $y^2=50 x^6+66 x^5+55 x^4+76 x^3+58 x^2+26 x+10$
  • $y^2=71 x^6+33 x^5+65 x^4+53 x^3+74 x^2+62 x+8$
  • $y^2=73 x^6+4 x^5+53 x^4+22 x^3+3 x^2+29 x+77$
  • $y^2=54 x^6+23 x^5+60 x^4+9 x^3+46 x^2+66 x+14$
  • $y^2=33 x^6+65 x^5+15 x^4+29 x^3+25 x^2+48 x+52$
  • $y^2=67 x^6+25 x^5+28 x^4+74 x^3+53 x^2+10 x+14$
  • $y^2=71 x^6+23 x^5+63 x^4+44 x^3+38 x^2+5 x+26$
  • $y^2=61 x^6+78 x^5+44 x^4+39 x^3+24 x^2+70 x$
  • $y^2=38 x^6+23 x^5+6 x^4+26 x^3+45 x^2+59 x+66$
  • and 272 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.am $\times$ 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:

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.abc_nm$2$(not in LMFDB)
2.79.ae_abi$2$(not in LMFDB)
2.79.bc_nm$2$(not in LMFDB)