Properties

Label 2.73.k_dm
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:  $( 1 - 4 x + 73 x^{2} )( 1 + 14 x + 73 x^{2} )$
  $1 + 10 x + 90 x^{2} + 730 x^{3} + 5329 x^{4}$
Frobenius angles:  $\pm0.424791481369$, $\pm0.805631034678$
Angle rank:  $2$ (numerical)
Jacobians:  $736$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6160$ $28828800$ $151525361680$ $806514508800000$ $4297263157615766800$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $84$ $5410$ $389508$ $28400158$ $2072896644$ $151335019330$ $11047402324308$ $806460099971518$ $58871586638414004$ $4297625822671214050$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 736 curves (of which all are hyperelliptic):

  • $y^2=42 x^6+40 x^5+26 x^4+48 x^3+34 x^2+54 x+63$
  • $y^2=19 x^6+41 x^5+19 x^4+26 x^3+26 x^2+20 x+70$
  • $y^2=71 x^6+45 x^5+35 x^4+14 x^3+36 x^2+34 x+69$
  • $y^2=38 x^6+17 x^5+66 x^4+4 x^3+19 x^2+37 x+42$
  • $y^2=62 x^6+71 x^5+65 x^4+25 x^3+45 x^2+18 x+21$
  • $y^2=29 x^6+19 x^5+62 x^4+5 x^3+41 x^2+33 x+51$
  • $y^2=68 x^6+61 x^5+26 x^4+71 x^3+46 x^2+40 x+11$
  • $y^2=48 x^6+25 x^5+47 x^4+32 x^3+27 x^2+52$
  • $y^2=34 x^6+67 x^5+8 x^4+45 x^3+68 x^2+13 x+7$
  • $y^2=26 x^6+36 x^5+11 x^4+24 x^3+7 x^2+55 x+5$
  • $y^2=68 x^6+71 x^5+36 x^4+43 x^3+47 x^2+4 x+12$
  • $y^2=x^6+5 x^5+31 x^4+33 x^3+67 x^2+18 x+9$
  • $y^2=32 x^6+23 x^5+8 x^4+63 x^3+2 x^2+8 x+61$
  • $y^2=68 x^6+51 x^5+31 x^4+28 x^3+65 x^2+60 x+63$
  • $y^2=55 x^6+20 x^5+18 x^4+25 x^3+36 x^2+61 x+3$
  • $y^2=72 x^6+54 x^5+50 x^4+35 x^3+32 x^2+7 x+13$
  • $y^2=56 x^6+12 x^5+49 x^4+30 x^3+72 x^2+45 x+18$
  • $y^2=30 x^6+55 x^5+30 x^4+6 x^3+48 x^2+23 x+39$
  • $y^2=10 x^6+36 x^5+x^4+65 x^3+31 x^2+36 x+55$
  • $y^2=63 x^6+36 x^5+18 x^4+66 x^3+19 x^2+32 x+51$
  • and 716 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.ae $\times$ 1.73.o 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.as_hu$2$(not in LMFDB)
2.73.ak_dm$2$(not in LMFDB)
2.73.s_hu$2$(not in LMFDB)