Abelian variety isogeny class 1.67.c over $\F_{67}$

• Label: 1.67.c
• Base field: $\F_{67}$
• Dimension: $1$
• $p$-rank: $1$
• Ordinary: yes
• Supersingular: no
• Simple: yes
• Geometrically simple: yes
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{67}$
Dimension:	$1$
L-polynomial:	$1 + 2 x + 67 x^{2}$
Frobenius angles:	$\pm0.538985133153$
Angle rank:	$1$ (numerical)
Number field:	\(\Q(\sqrt{-66}) \)
Galois group:	$C_2$
Jacobians:	$8$
Isomorphism classes:	8

This isogeny class is simple and geometrically simple, primitive, ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

This isogeny class is ordinary.

$p$-rank:	$1$
Slopes:	$[0, 1]$

Point counts

Point counts of the abelian variety

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$70$	$4620$	$300370$	$20143200$	$1350167350$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$70$	$4620$	$300370$	$20143200$	$1350167350$	$90458828460$	$6060707882530$	$406067655100800$	$27206534690633830$	$1822837805467625100$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 8 curves (of which 0 are hyperelliptic):

• $y^2=x^3+54 x+41$
• $y^2=x^3+6 x+12$
• $y^2=x^3+34 x+34$
• $y^2=x^3+57 x+57$
• $y^2=x^3+27 x+27$
• $y^2=x^3+12 x+24$
• $y^2=x^3+9 x+18$
• $y^2=x^3+50 x+50$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{67}$.

Endomorphism algebra over $\F_{67}$

The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-66}) \).

Base change

This is a primitive isogeny class.

Twists

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

Twist	Extension degree	Common base change
1.67.ac	$2$	(not in LMFDB)