Properties

Label 2.73.k_ff
Base field $\F_{73}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple no
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

Related objects

Downloads

Learn more

Invariants

Base field:  $\F_{73}$
Dimension:  $2$
L-polynomial:  $( 1 - x + 73 x^{2} )( 1 + 11 x + 73 x^{2} )$
  $1 + 10 x + 135 x^{2} + 730 x^{3} + 5329 x^{4}$
Frobenius angles:  $\pm0.481361674224$, $\pm0.722612475433$
Angle rank:  $2$ (numerical)
Jacobians:  $360$
Cyclic group of points:    yes

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6205$ $29318625$ $151000213840$ $806450559665625$ $4297505700183121525$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $84$ $5500$ $388158$ $28397908$ $2073013644$ $151334572750$ $11047407704508$ $806459997351268$ $58871586469565454$ $4297625836302227500$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 360 curves (of which all are hyperelliptic):

  • $y^2=64 x^6+47 x^5+53 x^4+60 x^3+39 x^2+53 x+53$
  • $y^2=9 x^6+28 x^5+65 x^4+5 x^3+45 x^2+54 x+50$
  • $y^2=48 x^6+17 x^5+46 x^4+63 x^3+44 x^2+63 x+55$
  • $y^2=57 x^6+9 x^5+25 x^4+49 x^3+23 x^2+36 x+55$
  • $y^2=21 x^6+31 x^5+7 x^4+41 x^3+62 x^2+12 x+70$
  • $y^2=37 x^6+60 x^5+19 x^4+19 x^3+55 x^2+31 x+23$
  • $y^2=71 x^6+12 x^5+24 x^4+12 x^3+22 x^2+15 x+30$
  • $y^2=67 x^6+64 x^5+7 x^4+3 x^3+28 x^2+2 x+54$
  • $y^2=6 x^6+46 x^5+43 x^4+43 x^3+69 x^2+58 x+15$
  • $y^2=25 x^6+10 x^5+61 x^4+65 x^3+7 x^2+50 x+6$
  • $y^2=31 x^6+55 x^5+4 x^4+63 x^3+64 x^2+16 x+16$
  • $y^2=54 x^6+29 x^5+8 x^4+16 x^3+23 x^2+63 x+64$
  • $y^2=31 x^6+40 x^5+72 x^4+46 x^3+6 x^2+40 x+12$
  • $y^2=13 x^6+59 x^5+63 x^4+36 x^3+13 x^2+18 x+25$
  • $y^2=37 x^6+10 x^5+24 x^4+48 x^3+16 x^2+45 x+38$
  • $y^2=10 x^6+36 x^5+61 x^4+49 x^3+19 x^2+71 x+36$
  • $y^2=7 x^6+51 x^5+60 x^4+12 x^3+60 x^2+61 x+2$
  • $y^2=65 x^6+41 x^5+52 x^4+31 x^3+49 x^2+49 x+34$
  • $y^2=46 x^6+12 x^5+11 x^4+64 x^3+32 x^2+49 x+61$
  • $y^2=25 x^6+7 x^5+3 x^4+10 x^3+72 x^2+67 x+3$
  • and 340 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{73}$.

Endomorphism algebra over $\F_{73}$
The isogeny class factors as 1.73.ab $\times$ 1.73.l and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. 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
2.73.am_gb$2$(not in LMFDB)
2.73.ak_ff$2$(not in LMFDB)
2.73.m_gb$2$(not in LMFDB)