Properties

Label 2.89.m_hq
Base field $\F_{89}$
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:  $\F_{89}$
Dimension:  $2$
L-polynomial:  $( 1 + 2 x + 89 x^{2} )( 1 + 10 x + 89 x^{2} )$
  $1 + 12 x + 198 x^{2} + 1068 x^{3} + 7921 x^{4}$
Frobenius angles:  $\pm0.533804287064$, $\pm0.677807684489$
Angle rank:  $2$ (numerical)
Jacobians:  $202$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $9200$ $64768000$ $495435465200$ $3936295407616000$ $31182427624020086000$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $102$ $8174$ $702774$ $62737566$ $5584186182$ $496981045262$ $44231335139478$ $3936588753112126$ $350356403548826406$ $31181719943968553774$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 202 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{89}$.

Endomorphism algebra over $\F_{89}$
The isogeny class factors as 1.89.c $\times$ 1.89.k 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
2.89.am_hq$2$(not in LMFDB)
2.89.ai_gc$2$(not in LMFDB)
2.89.i_gc$2$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.89.am_hq$2$(not in LMFDB)
2.89.ai_gc$2$(not in LMFDB)
2.89.i_gc$2$(not in LMFDB)
2.89.as_ic$4$(not in LMFDB)
2.89.ao_fq$4$(not in LMFDB)
2.89.o_fq$4$(not in LMFDB)
2.89.s_ic$4$(not in LMFDB)