Properties

Label 2.67.a_cs
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:  $( 1 - 8 x + 67 x^{2} )( 1 + 8 x + 67 x^{2} )$
  $1 + 70 x^{2} + 4489 x^{4}$
Frobenius angles:  $\pm0.337479373807$, $\pm0.662520626193$
Angle rank:  $1$ (numerical)
Jacobians:  $694$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $4560$ $20793600$ $90457782480$ $406232087040000$ $1822837805586718800$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $68$ $4630$ $300764$ $20159278$ $1350125108$ $90457182790$ $6060711605324$ $406067724900958$ $27206534396294948$ $1822837806621676150$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 694 curves (of which all are hyperelliptic):

  • $y^2=4 x^6+10 x^5+9 x^4+24 x^3+11 x^2+51 x+50$
  • $y^2=8 x^6+20 x^5+18 x^4+48 x^3+22 x^2+35 x+33$
  • $y^2=61 x^6+65 x^5+2 x^4+33 x^3+2 x^2+65 x+61$
  • $y^2=55 x^6+63 x^5+4 x^4+66 x^3+4 x^2+63 x+55$
  • $y^2=28 x^6+44 x^5+55 x^4+42 x^3+15 x^2+52 x+50$
  • $y^2=56 x^6+21 x^5+43 x^4+17 x^3+30 x^2+37 x+33$
  • $y^2=12 x^6+10 x^5+29 x^4+48 x^3+43 x^2+30 x+24$
  • $y^2=24 x^6+20 x^5+58 x^4+29 x^3+19 x^2+60 x+48$
  • $y^2=28 x^6+48 x^5+47 x^4+21 x^3+8 x^2+5 x+10$
  • $y^2=46 x^6+9 x^5+49 x^4+2 x^3+31 x^2+18 x+3$
  • $y^2=48 x^6+33 x^5+37 x^4+61 x^3+52 x^2+53 x+1$
  • $y^2=29 x^6+66 x^5+7 x^4+55 x^3+37 x^2+39 x+2$
  • $y^2=62 x^6+22 x^5+37 x^4+18 x^3+18 x^2+13 x+10$
  • $y^2=57 x^6+44 x^5+7 x^4+36 x^3+36 x^2+26 x+20$
  • $y^2=6 x^6+12 x^5+11 x^4+9 x^3+53 x^2+51 x+65$
  • $y^2=12 x^6+24 x^5+22 x^4+18 x^3+39 x^2+35 x+63$
  • $y^2=28 x^6+55 x^5+27 x^4+10 x^3+27 x^2+55 x+28$
  • $y^2=56 x^6+43 x^5+54 x^4+20 x^3+54 x^2+43 x+56$
  • $y^2=37 x^6+57 x^5+33 x^4+49 x^3+55 x^2+63 x+43$
  • $y^2=7 x^6+47 x^5+66 x^4+31 x^3+43 x^2+59 x+19$
  • and 674 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.ai $\times$ 1.67.i 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.cs 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-51}) \)$)$

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.aq_hq$2$(not in LMFDB)
2.67.q_hq$2$(not in LMFDB)
2.67.a_acs$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.67.aq_hq$2$(not in LMFDB)
2.67.q_hq$2$(not in LMFDB)
2.67.a_acs$4$(not in LMFDB)
2.67.ai_ad$6$(not in LMFDB)
2.67.i_ad$6$(not in LMFDB)