Properties

Label 2.71.e_ac
Base field $\F_{71}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple yes
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{71}$
Dimension:  $2$
L-polynomial:  $1 + 4 x - 2 x^{2} + 284 x^{3} + 5041 x^{4}$
Frobenius angles:  $\pm0.293886914714$, $\pm0.817779342299$
Angle rank:  $2$ (numerical)
Number field:  \(\Q(\sqrt{-33 +2 \sqrt{37}})\)
Galois group:  $D_{4}$
Jacobians:  $414$
Cyclic group of points:    no
Non-cyclic primes:   $2$

This isogeny class is simple and 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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5328$ $25318656$ $128437242192$ $646140608188416$ $3255110914228173648$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $76$ $5022$ $358852$ $25426910$ $1804155836$ $128100442302$ $9095110314548$ $645753515052094$ $45848501089150252$ $3255243551491947102$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 414 curves (of which all are hyperelliptic):

  • $y^2=46 x^6+69 x^5+67 x^4+41 x^3+25 x^2+34 x+31$
  • $y^2=44 x^6+15 x^5+49 x^4+22 x^3+11 x^2+52 x+64$
  • $y^2=26 x^6+40 x^5+18 x^4+31 x^3+54 x^2+66 x+40$
  • $y^2=8 x^6+4 x^5+39 x^4+x^3+4 x^2+70 x+16$
  • $y^2=57 x^6+16 x^5+25 x^4+24 x^3+53 x^2+70 x+43$
  • $y^2=66 x^6+70 x^5+23 x^4+38 x^3+56 x^2+47 x+49$
  • $y^2=26 x^6+19 x^5+41 x^4+65 x^3+54 x^2+10 x+62$
  • $y^2=56 x^6+20 x^5+18 x^4+31 x^3+11 x^2+51 x+43$
  • $y^2=21 x^6+32 x^5+4 x^4+50 x^3+47 x^2+67 x$
  • $y^2=34 x^6+28 x^5+27 x^4+65 x^3+50 x^2+40 x+44$
  • $y^2=7 x^6+x^5+29 x^4+61 x^3+33 x^2+52 x+39$
  • $y^2=13 x^6+19 x^5+67 x^4+3 x^3+21 x^2+49 x+64$
  • $y^2=36 x^6+17 x^5+60 x^4+17 x^3+49 x^2+37 x+66$
  • $y^2=38 x^6+57 x^5+40 x^4+60 x^3+62 x^2+47 x+18$
  • $y^2=25 x^6+56 x^5+47 x^4+42 x^3+33 x^2+12 x+43$
  • $y^2=6 x^6+28 x^5+65 x^4+10 x^3+15 x^2+9 x+1$
  • $y^2=37 x^6+62 x^5+25 x^4+30 x^3+28 x^2+36 x+27$
  • $y^2=55 x^6+51 x^5+5 x^4+25 x^3+16 x^2+54 x+20$
  • $y^2=67 x^6+61 x^5+10 x^4+39 x^3+34 x^2+68 x+10$
  • $y^2=44 x^6+48 x^5+44 x^4+15 x^3+10 x^2+46 x+52$
  • and 394 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{71}$.

Endomorphism algebra over $\F_{71}$
The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-33 +2 \sqrt{37}})\).

Base change

This is a primitive isogeny class.

Twists

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

TwistExtension degreeCommon base change
2.71.ae_ac$2$(not in LMFDB)