Properties

Label 2.79.d_de
Base field $\F_{79}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
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:  $1 + 3 x + 82 x^{2} + 237 x^{3} + 6241 x^{4}$
Frobenius angles:  $\pm0.364397291511$, $\pm0.697730624844$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(\sqrt{-3}, \sqrt{313})\)
Galois group:  $C_2^2$
Jacobians:  $280$
Cyclic group of points:    no
Non-cyclic primes:   $2$

This isogeny class is simple but not geometrically 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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6564$ $39935376$ $243086633712$ $1517558504993856$ $9467998885629219324$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $83$ $6397$ $493040$ $38961625$ $3076966313$ $243085811902$ $19203918568463$ $1517108865247249$ $119851595982618320$ $9468276086075737477$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 280 curves (of which all are hyperelliptic):

  • $y^2=37 x^6+21 x^5+61 x^4+35 x^3+39 x^2+67 x+4$
  • $y^2=18 x^6+74 x^5+42 x^4+76 x^3+69 x^2+40 x+68$
  • $y^2=x^6+x^3+47$
  • $y^2=54 x^6+62 x^5+41 x^4+36 x^3+21 x^2+5 x+38$
  • $y^2=47 x^6+69 x^5+15 x^4+78 x^3+28 x^2+28 x+36$
  • $y^2=46 x^6+20 x^5+30 x^4+54 x^3+66 x^2+14 x+1$
  • $y^2=38 x^6+35 x^5+47 x^4+25 x^3+39 x^2+45 x+9$
  • $y^2=31 x^6+53 x^5+65 x^4+6 x^3+65 x^2+36 x+36$
  • $y^2=45 x^6+77 x^5+34 x^4+19 x^3+16 x^2+55 x+73$
  • $y^2=48 x^6+31 x^5+60 x^4+21 x^3+38 x^2+22 x$
  • $y^2=52 x^6+42 x^5+46 x^4+22 x^3+14 x^2+22 x+65$
  • $y^2=74 x^6+17 x^5+65 x^4+17 x^3+27 x^2+18 x+61$
  • $y^2=23 x^6+9 x^5+41 x^4+32 x^3+71 x^2+25 x+35$
  • $y^2=62 x^6+75 x^5+17 x^4+35 x^3+10 x^2+15 x+30$
  • $y^2=35 x^6+38 x^5+16 x^4+17 x^3+77 x^2+36 x+66$
  • $y^2=31 x^6+67 x^5+64 x^4+77 x^3+48 x^2+67 x+25$
  • $y^2=6 x^6+57 x^5+13 x^4+8 x^3+2 x^2+13 x+23$
  • $y^2=29 x^6+57 x^5+70 x^4+41 x^3+50 x^2+47 x+9$
  • $y^2=9 x^6+36 x^5+58 x^4+69 x^3+75 x^2+58 x+32$
  • $y^2=3 x^6+24 x^5+3 x^4+7 x^3+66 x^2+6 x+25$
  • and 260 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{79^{6}}$.

Endomorphism algebra over $\F_{79}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-3}, \sqrt{313})\).
Endomorphism algebra over $\overline{\F}_{79}$
The base change of $A$ to $\F_{79^{6}}$ is 1.243087455521.abutsc 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-939}) \)$)$
Remainder of endomorphism lattice by field

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.ad_de$2$(not in LMFDB)
2.79.ad_de$3$(not in LMFDB)
2.79.a_afz$3$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.79.ad_de$2$(not in LMFDB)
2.79.ad_de$3$(not in LMFDB)
2.79.a_afz$3$(not in LMFDB)
2.79.a_fz$12$(not in LMFDB)