Properties

Label 2.73.i_s
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

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Invariants

Base field:  $\F_{73}$
Dimension:  $2$
L-polynomial:  $( 1 - 8 x + 73 x^{2} )( 1 + 16 x + 73 x^{2} )$
  $1 + 8 x + 18 x^{2} + 584 x^{3} + 5329 x^{4}$
Frobenius angles:  $\pm0.344915434243$, $\pm0.885799748780$
Angle rank:  $2$ (numerical)
Jacobians:  $260$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $5940$ $28250640$ $152048419380$ $806530911436800$ $4297461664353491700$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $82$ $5302$ $390850$ $28400734$ $2072992402$ $151333894294$ $11047391382466$ $806460187931326$ $58871586684329170$ $4297625834103396982$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 260 curves (of which all are hyperelliptic):

  • $y^2=59 x^6+40 x^5+17 x^4+42 x^3+31 x^2+22 x+12$
  • $y^2=62 x^6+42 x^5+24 x^4+x^3+16 x^2+29 x+65$
  • $y^2=60 x^6+7 x^5+22 x^4+28 x^3+50 x^2+46 x+3$
  • $y^2=20 x^6+68 x^5+6 x^4+2 x^3+6 x^2+9 x+9$
  • $y^2=22 x^6+8 x^5+5 x^4+49 x^3+43 x^2+28 x+65$
  • $y^2=72 x^6+51 x^5+66 x^4+50 x^3+51 x^2+3 x+57$
  • $y^2=20 x^6+37 x^5+55 x^4+68 x^3+50 x^2+5 x+7$
  • $y^2=39 x^6+15 x^4+41 x^3+46 x^2+53 x+16$
  • $y^2=26 x^6+42 x^5+13 x^4+36 x^3+63 x^2+2 x+39$
  • $y^2=43 x^6+44 x^5+67 x^4+56 x^3+71 x^2+71 x+18$
  • $y^2=30 x^6+65 x^5+38 x^4+17 x^3+46 x^2+54 x+48$
  • $y^2=63 x^6+55 x^5+12 x^4+61 x^3+56 x^2+40 x+60$
  • $y^2=9 x^6+34 x^5+x^4+4 x^3+24 x^2+10 x+67$
  • $y^2=39 x^6+13 x^5+29 x^4+10 x^3+53 x^2+68 x+18$
  • $y^2=38 x^6+5 x^5+7 x^4+27 x^3+17 x^2+63 x+24$
  • $y^2=45 x^6+53 x^5+55 x^4+54 x^3+65 x^2+2 x+20$
  • $y^2=26 x^6+67 x^5+35 x^4+19 x^3+40 x^2+55 x+14$
  • $y^2=14 x^6+7 x^5+31 x^4+49 x^3+64 x^2+3 x+6$
  • $y^2=57 x^6+67 x^5+57 x^4+38 x^3+30 x^2+40 x+4$
  • $y^2=61 x^6+26 x^5+72 x^4+32 x^3+53 x^2+25 x+17$
  • and 240 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.ai $\times$ 1.73.q 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 are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.73.ay_ko$2$(not in LMFDB)
2.73.ai_s$2$(not in LMFDB)
2.73.y_ko$2$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.73.ay_ko$2$(not in LMFDB)
2.73.ai_s$2$(not in LMFDB)
2.73.y_ko$2$(not in LMFDB)
2.73.ao_hm$4$(not in LMFDB)
2.73.ac_du$4$(not in LMFDB)
2.73.c_du$4$(not in LMFDB)
2.73.o_hm$4$(not in LMFDB)