Properties

Label 2.79.a_o
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

Related objects

Downloads

Learn more

Invariants

Base field:  $\F_{79}$
Dimension:  $2$
L-polynomial:  $( 1 - 12 x + 79 x^{2} )( 1 + 12 x + 79 x^{2} )$
  $1 + 14 x^{2} + 6241 x^{4}$
Frobenius angles:  $\pm0.264120855861$, $\pm0.735879144139$
Angle rank:  $1$ (numerical)
Jacobians:  $377$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6256$ $39137536$ $243087196144$ $1518066120167424$ $9468276085268264176$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $80$ $6270$ $493040$ $38974654$ $3077056400$ $243086936766$ $19203908986160$ $1517108663815294$ $119851595982618320$ $9468276087909681150$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 377 curves (of which all are hyperelliptic):

  • $y^2=50 x^6+64 x^4+34 x^2+7$
  • $y^2=31 x^6+33 x^4+20 x^2+47$
  • $y^2=60 x^6+24 x^5+60 x^4+2 x^3+61 x^2+27 x+40$
  • $y^2=22 x^6+72 x^5+22 x^4+6 x^3+25 x^2+2 x+41$
  • $y^2=72 x^6+46 x^5+55 x^4+14 x^3+67 x^2+74 x+41$
  • $y^2=58 x^6+59 x^5+7 x^4+42 x^3+43 x^2+64 x+44$
  • $y^2=41 x^6+67 x^5+58 x^4+4 x^3+52 x^2+18 x+9$
  • $y^2=63 x^6+57 x^5+61 x^4+10 x^3+9 x^2+42 x+60$
  • $y^2=31 x^6+13 x^5+25 x^4+30 x^3+27 x^2+47 x+22$
  • $y^2=76 x^6+46 x^5+39 x^4+26 x^3+63 x^2+28 x+29$
  • $y^2=11 x^6+8 x^5+51 x^4+58 x^3+68 x^2+23 x+29$
  • $y^2=21 x^6+51 x^5+41 x^4+71 x^3+64 x^2+75 x+24$
  • $y^2=63 x^6+74 x^5+44 x^4+55 x^3+34 x^2+67 x+72$
  • $y^2=73 x^6+7 x^5+50 x^4+23 x^3+16 x^2+35 x+56$
  • $y^2=61 x^6+21 x^5+71 x^4+69 x^3+48 x^2+26 x+10$
  • $y^2=52 x^6+46 x^5+10 x^4+68 x^3+3 x^2+31 x+27$
  • $y^2=6 x^6+64 x^5+19 x^4+62 x^3+55 x^2+23 x+64$
  • $y^2=18 x^6+34 x^5+57 x^4+28 x^3+7 x^2+69 x+34$
  • $y^2=35 x^6+58 x^5+11 x^4+74 x^3+20 x^2+32 x+5$
  • $y^2=26 x^6+16 x^5+33 x^4+64 x^3+60 x^2+17 x+15$
  • and 357 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.am $\times$ 1.79.m 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.o 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-43}) \)$)$

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.ay_lq$2$(not in LMFDB)
2.79.y_lq$2$(not in LMFDB)
2.79.a_ao$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.79.ay_lq$2$(not in LMFDB)
2.79.y_lq$2$(not in LMFDB)
2.79.a_ao$4$(not in LMFDB)
2.79.am_cn$6$(not in LMFDB)
2.79.m_cn$6$(not in LMFDB)