Abelian variety isogeny class 2.41.ai_bi over $\F_{41}$

• Label: 2.41.ai_bi
• Base field: $\F_{41}$
• Dimension: $2$
• $p$-rank: $2$
• Ordinary: yes
• Supersingular: no
• Simple: no
• Geometrically simple: no
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{41}$
Dimension:	$2$
L-polynomial:	$( 1 - 12 x + 41 x^{2} )( 1 + 4 x + 41 x^{2} )$
	$1 - 8 x + 34 x^{2} - 328 x^{3} + 1681 x^{4}$
Frobenius angles:	$\pm0.113551764296$, $\pm0.601115334803$
Angle rank:	$2$ (numerical)
Jacobians:	$64$
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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$1380$	$2831760$	$4703482980$	$7980760535040$	$13425680242654500$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$34$	$1686$	$68242$	$2824286$	$115882274$	$4750133238$	$194754278354$	$7984935311806$	$327381980587042$	$13422659289610326$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 64 curves (of which all are hyperelliptic):

• $y^2=23 x^6+24 x^5+x^4+20 x^3+29 x^2+33 x+28$
• $y^2=32 x^6+26 x^5+30 x^4+24 x^3+33 x^2+9 x+29$
• $y^2=12 x^6+18 x^5+15 x^4+6 x^3+16 x^2+38 x$
• $y^2=9 x^6+27 x^5+17 x^4+26 x^3+25 x^2+34 x+35$
• $y^2=23 x^6+19 x^5+18 x^4+15 x^3+24 x^2+30 x+29$
• $y^2=19 x^6+11 x^5+20 x^4+27 x^3+38 x^2+30 x+5$
• $y^2=29 x^6+34 x^5+12 x^4+8 x^3+12 x^2+34 x+29$
• $y^2=12 x^6+31 x^4+21 x^3+29 x^2+2 x+32$
• $y^2=34 x^6+8 x^5+11 x^4+37 x^3+11 x^2+8 x+34$
• $y^2=9 x^6+34 x^5+4 x^4+19 x^3+20 x^2+25 x+31$
• $y^2=2 x^6+17 x^5+29 x^4+11 x^3+32 x^2+9 x+29$
• $y^2=13 x^6+14 x^5+34 x^4+35 x^3+4 x^2+31 x+7$
• $y^2=4 x^6+16 x^5+21 x^4+26 x^3+6 x^2+19 x+23$
• $y^2=22 x^6+39 x^5+17 x^4+13 x^3+18 x^2+40 x+24$
• $y^2=40 x^6+25 x^5+37 x^4+36 x^3+23 x^2+15 x+6$
• $y^2=15 x^6+10 x^5+29 x^4+32 x^3+27 x^2+29 x+22$
• $y^2=5 x^6+23 x^5+16 x^4+36 x^3+11 x^2+20 x+9$
• $y^2=x^6+14 x^5+29 x^4+37 x^3+6 x^2+40 x+37$
• $y^2=34 x^6+35 x^5+7 x^4+11 x^3+29 x^2+26 x+3$
• $y^2=38 x^6+37 x^5+9 x^4+34 x^3+36 x^2+14 x+9$
• and

• $y^2=16 x^6+36 x^5+22 x^4+2 x^3+23 x^2+16$
• $y^2=20 x^6+32 x^5+12 x^4+31 x^3+34 x^2+20 x+32$
• $y^2=11 x^6+36 x^5+17 x^4+24 x^3+17 x^2+36 x+11$
• $y^2=31 x^6+27 x^5+2 x^4+29 x^3+25 x^2+27 x+8$
• $y^2=27 x^6+39 x^5+38 x^4+4 x^3+15 x^2+32 x+28$
• $y^2=11 x^6+14 x^5+22 x^4+26 x^3+33 x^2+11 x+33$
• $y^2=19 x^6+15 x^5+4 x^4+21 x^2+28 x+29$
• $y^2=29 x^6+38 x^5+x^3+27 x^2+5 x+15$
• $y^2=15 x^6+16 x^5+12 x^4+30 x^3+27 x^2+4 x+35$
• $y^2=12 x^6+4 x^5+18 x^4+29 x^3+16 x^2+35 x+37$
• $y^2=6 x^6+24 x^5+15 x^4+31 x^3+14 x^2+21 x+3$
• $y^2=33 x^6+4 x^5+20 x^4+13 x^3+37 x^2+20 x+40$
• $y^2=36 x^6+16 x^5+7 x^4+13 x^3+8 x^2+34 x+25$
• $y^2=23 x^6+25 x^5+35 x^4+25 x^3+20 x^2+8 x+11$
• $y^2=40 x^6+27 x^5+6 x^4+15 x^3+13 x^2+x+19$
• $y^2=8 x^6+31 x^5+21 x^4+28 x^3+29 x^2+x+5$
• $y^2=21 x^6+39 x^5+38 x^4+40 x^3+36 x^2+6 x+17$
• $y^2=12 x^6+34 x^5+3 x^4+12 x^3+36 x^2+33 x+37$
• $y^2=27 x^6+7 x^5+15 x^4+6 x^3+27 x^2+26 x+22$
• $y^2=15 x^6+15 x^5+10 x^4+5 x^3+29 x^2+31 x+15$
• $y^2=18 x^6+36 x^5+34 x^4+19 x^3+14 x^2+5 x+13$
• $y^2=40 x^6+29 x^5+9 x^4+11 x^3+x^2+35 x+12$
• $y^2=16 x^6+25 x^5+11 x^4+8 x^3+4 x^2+38 x+19$
• $y^2=3 x^6+27 x^5+x^4+18 x^3+4 x^2+36 x$
• $y^2=38 x^6+28 x^5+36 x^4+12 x^3+40 x^2+34$
• $y^2=28 x^6+28 x^5+37 x^4+6 x^3+2 x^2+33 x+31$
• $y^2=x^6+16 x^5+18 x^4+5 x^3+20 x^2+6 x+23$
• $y^2=37 x^6+25 x^5+16 x^4+39 x^3+26 x^2+8 x+6$
• $y^2=30 x^6+3 x^5+27 x^4+17 x^3+30 x^2+4 x+29$
• $y^2=30 x^6+25 x^5+31 x^4+6 x^3+9 x^2+32 x+5$
• $y^2=19 x^6+33 x^5+25 x^4+16 x^3+9 x^2+16 x+32$
• $y^2=14 x^6+27 x^5+27 x^4+23 x^3+4 x^2+22 x+5$
• $y^2=34 x^6+5 x^5+33 x^4+19 x^3+40 x^2+32 x+12$
• $y^2=35 x^6+38 x^5+28 x^4+39 x^3+28 x^2+38 x+35$
• $y^2=13 x^6+36 x^5+34 x^4+37 x^3+37 x^2+5 x+3$
• $y^2=13 x^6+23 x^5+30 x^4+8 x^3+4 x^2+13 x+9$
• $y^2=34 x^6+3 x^5+27 x^4+27 x^2+3 x+34$
• $y^2=x^6+4 x^5+5 x^4+6 x^3+20 x^2+34 x+14$
• $y^2=9 x^6+27 x^5+18 x^4+15 x^3+14 x^2+2 x+31$
• $y^2=27 x^6+34 x^5+7 x^4+23 x^3+39 x^2+5 x+36$
• $y^2=29 x^6+14 x^5+9 x^4+36 x^3+21 x^2+4 x+15$
• $y^2=27 x^6+x^5+10 x^4+36 x^3+10 x^2+x+27$
• $y^2=8 x^6+13 x^4+5 x^3+x^2+26 x+30$
• $y^2=23 x^6+26 x^5+33 x^3+6 x^2+22 x+34$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{41}$.

Endomorphism algebra over $\F_{41}$

The isogeny class factors as 1.41.am $\times$ 1.41.e and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

• 1.41.am : \(\Q(\sqrt{-5}) \).
• 1.41.e : \(\Q(\sqrt{-37}) \).

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
2.41.aq_fa	$2$	(not in LMFDB)
2.41.i_bi	$2$	(not in LMFDB)
2.41.q_fa	$2$	(not in LMFDB)