Properties

Label 3.16.ag_g_br
Base field $\F_{2^{4}}$
Dimension $3$
$p$-rank $3$
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:  $\F_{2^{4}}$
Dimension:  $3$
L-polynomial:  $( 1 - 5 x + 16 x^{2} )( 1 - x - 15 x^{2} - 16 x^{3} + 256 x^{4} )$
  $1 - 6 x + 6 x^{2} + 43 x^{3} + 96 x^{4} - 1536 x^{5} + 4096 x^{6}$
Frobenius angles:  $\pm0.126773578992$, $\pm0.285098958592$, $\pm0.793440245659$
Angle rank:  $2$ (numerical)
Cyclic group of points:    no
Non-cyclic primes:   $3, 5$

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:  $3$
Slopes:  $[0, 0, 0, 1, 1, 1]$

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $2700$ $15384600$ $69087330000$ $285418945350000$ $1152124171115017500$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $11$ $233$ $4118$ $66449$ $1047851$ $16784150$ $268427891$ $4294954529$ $68720531918$ $1099512844553$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 92 hyperelliptic curves, but it is unknown how many Jacobians of non-hyperelliptic curves it contains:

  • $y^2+(a^2 x^4+a x) y=x^3+(a^2+a+1) x^2+(a^3+a+1) x+1$
  • $y^2+(a^2 x^4+a x) y=(a^2+1) x^3+(a+1) x^2+(a^2+1) x+a^3+a^2+a$
  • $y^2+(a^3 x^4+a x) y=(a+1) x^3+(a^3+a^2) x^2+(a^3+a) x+a^2+a+1$
  • $y^2+(a^3 x^4+a x) y=(a^2+1) x^3+a^3 x^2+a^2 x+a^2+1$
  • $y^2+(a x^4+a x^3+a x) y=x^8+x^3+(a+1) x^2+a^2 x+a^3+a^2+a$
  • $y^2+(a x^4+a x^3+a x) y=x^8+a x^3+a^2 x^2+a^2 x+1$
  • $y^2+(a x^4+a x^3+a x) y=x^8+a x^3+(a^2+a+1) x^2+(a^2+1) x+1$
  • $y^2+(a x^4+a x^3+a x) y=x^8+a x^3+(a^3+a+1) x^2+a^3+a^2+a$
  • $y^2+(a x^4+a x^3+a x) y=x^8+a x^3+(a^3+a^2) x^2+(a^3+a) x+a^3+a^2+a$
  • $y^2+(a x^4+a x^3+a x) y=x^8+(a^2+1) x^3+a^3 x^2+1$
  • $y^2+(a x^4+a x^3+a x) y=x^8+(a^2+a) x^3+(a^3+1) x+a^3+1$
  • $y^2+(a x^4+a x^3+a x) y=x^8+(a^2+a) x^3+(a+1) x^2+(a^3+a^2+a+1) x+a$
  • $y^2+(a x^4+a x^3+a x) y=x^8+(a^2+a) x^3+a^3 x^2+(a^3+a+1) x+a^3+1$
  • $y^2+(a x^4+a x^3+a x) y=x^8+(a^2+a) x^3+(a^3+a^2+a+1) x^2+a x+a$
  • $y^2+(a x^4+a x^3+a x) y=x^8+(a^3+a) x^3+(a^3+a+1) x^2+(a^3+a^2+a+1) x+a^3+1$
  • $y^2+(a x^4+a x^3+a x) y=x^8+(a^3+a^2+a) x^3+a^2 x^2+(a^3+a+1) x+a$
  • $y^2+((a^3+1) x^4+a x^3+a x) y=a^2 x^3+(a^2+a+1) x^2+a x+a$
  • $y^2+((a^3+1) x^4+a x^3+a x) y=a^2 x^3+(a^2+a+1) x^2+(a+1) x+a+1$
  • $y^2+((a^3+1) x^4+a x^3+a x) y=(a^2+a) x^3+(a^2+a+1) x^2+a^3 x+a^3+a^2+a$
  • $y^2+((a^3+1) x^4+a x^3+a x) y=(a^2+a) x^3+(a^3+a+1) x^2+x+a$
  • and 72 more

where $a$ is a root of the Conway polynomial.

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{2^{12}}$.

Endomorphism algebra over $\F_{2^{4}}$
The isogeny class factors as 1.16.af $\times$ 2.16.ab_ap 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 $\overline{\F}_{2^{4}}$
The base change of $A$ to $\F_{2^{12}}$ is 1.4096.abv 2 $\times$ 1.4096.el. 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
3.16.ae_ae_ed$2$(not in LMFDB)
3.16.e_ae_aed$2$(not in LMFDB)
3.16.g_g_abr$2$(not in LMFDB)
3.16.ad_bn_adx$3$(not in LMFDB)

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

TwistExtension degreeCommon base change
3.16.ae_ae_ed$2$(not in LMFDB)
3.16.e_ae_aed$2$(not in LMFDB)
3.16.g_g_abr$2$(not in LMFDB)
3.16.ad_bn_adx$3$(not in LMFDB)
3.16.ah_ch_aiv$6$(not in LMFDB)
3.16.af_bv_afz$6$(not in LMFDB)
3.16.d_bn_dx$6$(not in LMFDB)
3.16.f_bv_fz$6$(not in LMFDB)
3.16.g_g_abr$6$(not in LMFDB)
3.16.h_ch_iv$6$(not in LMFDB)
3.16.af_ap_fz$12$(not in LMFDB)
3.16.f_ap_afz$12$(not in LMFDB)