Properties

Label 2.71.aq_fm
Base field $\F_{71}$
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:  $\F_{71}$
Dimension:  $2$
L-polynomial:  $( 1 - 16 x + 71 x^{2} )( 1 + 71 x^{2} )$
  $1 - 16 x + 142 x^{2} - 1136 x^{3} + 5041 x^{4}$
Frobenius angles:  $\pm0.101666819831$, $\pm0.5$
Angle rank:  $1$ (numerical)
Jacobians:  $238$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4032$ $25546752$ $127854756288$ $645423361228800$ $3255247567224418752$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $56$ $5070$ $357224$ $25398686$ $1804231576$ $128101242222$ $9095123880136$ $645753522754366$ $45848501131516664$ $3255243558221852430$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 238 curves (of which all are hyperelliptic):

  • $y^2=55 x^6+13 x^5+53 x^4+49 x^3+40 x^2+64 x+25$
  • $y^2=38 x^6+69 x^5+38 x^4+15 x^3+52 x^2+x+59$
  • $y^2=53 x^6+41 x^5+18 x^4+51 x^3+34 x^2+7 x+36$
  • $y^2=9 x^5+24 x^4+x^3+14 x^2+9 x+2$
  • $y^2=23 x^6+3 x^5+48 x^4+14 x^3+2 x^2+27 x+53$
  • $y^2=38 x^6+51 x^5+31 x^4+2 x^3+31 x^2+51 x+38$
  • $y^2=58 x^6+51 x^5+22 x^4+38 x^3+53 x^2+67 x+6$
  • $y^2=65 x^6+4 x^5+10 x^4+31 x^3+10 x^2+4 x+65$
  • $y^2=30 x^6+x^5+44 x^4+32 x^3+31 x^2+19 x+7$
  • $y^2=26 x^6+14 x^5+30 x^4+62 x^3+52 x^2+11 x+35$
  • $y^2=65 x^6+48 x^5+15 x^4+10 x^3+70 x^2+50 x+57$
  • $y^2=17 x^6+23 x^5+37 x^4+38 x^3+59 x^2+5 x+32$
  • $y^2=39 x^6+14 x^5+53 x^4+39 x^3+8 x^2+15 x+56$
  • $y^2=69 x^6+45 x^5+58 x^4+39 x^3+48 x^2+6 x+13$
  • $y^2=48 x^6+47 x^5+39 x^4+23 x^3+39 x^2+47 x+48$
  • $y^2=4 x^6+15 x^5+42 x^4+11 x^3+50 x^2+24 x+22$
  • $y^2=5 x^6+11 x^5+65 x^4+8 x^3+13 x^2+12 x+7$
  • $y^2=55 x^6+25 x^5+60 x^4+24 x^3+10 x^2+9 x+66$
  • $y^2=70 x^6+55 x^5+17 x^4+58 x^2+26 x+63$
  • $y^2=59 x^6+3 x^5+33 x^4+29 x^3+50 x^2+26 x+10$
  • and 218 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{71^{2}}$.

Endomorphism algebra over $\F_{71}$
The isogeny class factors as 1.71.aq $\times$ 1.71.a 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 $\overline{\F}_{71}$
The base change of $A$ to $\F_{71^{2}}$ is 1.5041.aek $\times$ 1.5041.fm. 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
2.71.q_fm$2$(not in LMFDB)