Abelian variety isogeny class 2.17.ac_c over $\F_{17}$

• Label: 2.17.ac_c
• Base field: $\F_{17}$
• Dimension: $2$
• $p$-rank: $2$
• Ordinary: yes
• Supersingular: no
• Simple: yes
• Geometrically simple: no
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{17}$
Dimension:	$2$
L-polynomial:	$1 - 2 x + 2 x^{2} - 34 x^{3} + 289 x^{4}$
Frobenius angles:	$\pm0.195139103345$, $\pm0.695139103345$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(i, \sqrt{33})\)
Galois group:	$C_2^2$
Jacobians:	$32$
Cyclic group of points:	no
Non-cyclic primes:	$2$

This isogeny class is simple but not geometrically 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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$256$	$83968$	$23660800$	$7050625024$	$2019629168896$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$16$	$290$	$4816$	$84414$	$1422416$	$24137570$	$410392208$	$6975693694$	$118586902672$	$2015993900450$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 32 curves (of which all are hyperelliptic):

• $y^2=16 x^6+10 x^5+10 x^3+8 x^2+15 x+15$
• $y^2=16 x^6+5 x^5+x^4+5 x^3+8 x^2+9 x+7$
• $y^2=3 x^5+5 x^4+12 x^3+7 x^2+2 x+13$
• $y^2=7 x^6+14 x^5+7 x^4+7 x^3+2 x^2+2 x$
• $y^2=3 x^6+13 x^5+6 x^4+10 x^3+12 x^2+10 x+4$
• $y^2=12 x^5+8 x^4+13 x^3+5 x^2+14 x+16$
• $y^2=7 x^6+16 x^5+11 x^4+7 x^3+16 x^2+13 x+6$
• $y^2=2 x^6+3 x^5+3 x^4+11 x^2+14 x+15$
• $y^2=5 x^6+8 x^5+10 x^4+2 x^3+15 x^2+12 x+9$
• $y^2=15 x^6+x^5+16 x^4+6 x^3+12 x^2+6 x+4$
• $y^2=4 x^6+6 x^5+9 x^4+3 x^3+6 x^2+8 x+3$
• $y^2=5 x^6+14 x^3+5 x^2+5 x+7$
• $y^2=7 x^6+x^5+12 x^4+5 x^3+16 x^2+11 x+2$
• $y^2=3 x^6+4 x^4+12 x^3+3 x^2+7 x+9$
• $y^2=2 x^6+16 x^5+11 x^4+11 x^3+4 x^2+9 x+8$
• $y^2=13 x^5+14 x^4+14 x^3+16 x^2+5 x+9$
• $y^2=4 x^6+7 x^5+6 x^4+3 x^3+11 x^2+6 x$
• $y^2=13 x^6+5 x^5+8 x^4+10 x^3+12 x^2+16 x+12$
• $y^2=x^6+7 x^4+x^3+8 x^2+5 x+12$
• $y^2=13 x^6+7 x^5+3 x^3+15 x$
• and

• $y^2=2 x^6+16 x^5+13 x^4+2 x^3+2 x^2+13 x+6$
• $y^2=7 x^6+7 x^5+x^4+x^3+x^2+5 x$
• $y^2=6 x^6+16 x^5+7 x^4+5 x^3+8 x^2+5 x+8$
• $y^2=3 x^6+4 x^5+12 x^4+8 x^3+16 x^2+8 x+6$
• $y^2=3 x^6+4 x^5+10 x^4+10 x^2+13 x+3$
• $y^2=12 x^6+7 x^3+6 x^2+3 x$
• $y^2=14 x^6+9 x^5+6 x^4+6 x^2+8 x+14$
• $y^2=12 x^6+5 x^5+10 x^4+10 x^3+7 x^2+16 x+16$
• $y^2=7 x^6+3 x^5+x^4+3 x^3+13 x^2+11 x+10$
• $y^2=x^6+14 x^5+6 x^4+16 x^3+6 x^2+7 x+4$
• $y^2=6 x^6+9 x^5+3 x^4+14 x^3+10 x^2+8 x$
• $y^2=10 x^6+3 x^5+16 x^4+x^3+11 x^2+10 x$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{17^{4}}$.

Endomorphism algebra over $\F_{17}$

The endomorphism algebra of this simple isogeny class is \(\Q(i, \sqrt{33})\).

Endomorphism algebra over $\overline{\F}_{17}$

The base change of $A$ to $\F_{17^{4}}$ is 1.83521.re^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-33}) \)$)$

Remainder of endomorphism lattice by field

• Endomorphism algebra over $\F_{17^{2}}$

  The base change of $A$ to $\F_{17^{2}}$ is the simple isogeny class 2.289.a_re and its endomorphism algebra is \(\Q(i, \sqrt{33})\).

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

Twist	Extension degree	Common base change
2.17.c_c	$2$	(not in LMFDB)
2.17.c_c	$4$	(not in LMFDB)
2.17.a_abg	$8$	(not in LMFDB)