Properties

Label 2.67.a_eo
Base field $\F_{67}$
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:  $\F_{67}$
Dimension:  $2$
L-polynomial:  $( 1 - 4 x + 67 x^{2} )( 1 + 4 x + 67 x^{2} )$
  $1 + 118 x^{2} + 4489 x^{4}$
Frobenius angles:  $\pm0.421429069538$, $\pm0.578570930462$
Angle rank:  $1$ (numerical)
Jacobians:  $425$
Cyclic group of points:    no
Non-cyclic primes:   $2, 3$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4608$ $21233664$ $90458436096$ $405868407422976$ $1822837802440647168$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $68$ $4726$ $300764$ $20141230$ $1350125108$ $90458490022$ $6060711605324$ $406067709235294$ $27206534396294948$ $1822837800329532886$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 425 curves (of which all are hyperelliptic):

  • $y^2=50 x^6+43 x^5+27 x^4+43 x^3+20 x^2+61 x+44$
  • $y^2=33 x^6+19 x^5+54 x^4+19 x^3+40 x^2+55 x+21$
  • $y^2=47 x^6+46 x^5+39 x^4+33 x^3+24 x^2+42 x+4$
  • $y^2=27 x^6+25 x^5+11 x^4+66 x^3+48 x^2+17 x+8$
  • $y^2=58 x^6+14 x^5+54 x^4+7 x^3+26 x^2+12 x+36$
  • $y^2=49 x^6+28 x^5+41 x^4+14 x^3+52 x^2+24 x+5$
  • $y^2=60 x^6+60 x^5+52 x^4+3 x^3+12 x^2+16 x+1$
  • $y^2=53 x^6+53 x^5+37 x^4+6 x^3+24 x^2+32 x+2$
  • $y^2=41 x^6+4 x^5+52 x^4+62 x^3+7 x^2+14 x+54$
  • $y^2=15 x^6+8 x^5+37 x^4+57 x^3+14 x^2+28 x+41$
  • $y^2=11 x^6+22 x^5+17 x^4+9 x^3+35 x^2+55 x+31$
  • $y^2=22 x^6+44 x^5+34 x^4+18 x^3+3 x^2+43 x+62$
  • $y^2=15 x^6+30 x^5+2 x^4+10 x^3+12 x^2+8 x+24$
  • $y^2=30 x^6+60 x^5+4 x^4+20 x^3+24 x^2+16 x+48$
  • $y^2=45 x^6+18 x^5+39 x^4+66 x^3+47 x^2+28 x+6$
  • $y^2=65 x^6+48 x^5+30 x^4+36 x^3+60 x^2+59 x+34$
  • $y^2=63 x^6+29 x^5+60 x^4+5 x^3+53 x^2+51 x+1$
  • $y^2=45 x^6+34 x^5+31 x^4+12 x^3+51 x^2+16 x+27$
  • $y^2=21 x^6+52 x^5+41 x^4+23 x^3+53 x^2+4 x$
  • $y^2=42 x^6+37 x^5+15 x^4+46 x^3+39 x^2+8 x$
  • and 405 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{67^{2}}$.

Endomorphism algebra over $\F_{67}$
The isogeny class factors as 1.67.ae $\times$ 1.67.e 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 $\overline{\F}_{67}$
The base change of $A$ to $\F_{67^{2}}$ is 1.4489.eo 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-7}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.67.ai_fu$2$(not in LMFDB)
2.67.i_fu$2$(not in LMFDB)
2.67.a_aeo$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.67.ai_fu$2$(not in LMFDB)
2.67.i_fu$2$(not in LMFDB)
2.67.a_aeo$4$(not in LMFDB)
2.67.ae_abz$6$(not in LMFDB)
2.67.e_abz$6$(not in LMFDB)