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

• Label: 2.41.am_eo
• 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:	$( 1 - 6 x + 41 x^{2} )^{2}$
	$1 - 12 x + 118 x^{2} - 492 x^{3} + 1681 x^{4}$
Frobenius angles:	$\pm0.344786929280$, $\pm0.344786929280$
Angle rank:	$1$ (numerical)
Jacobians:	$46$
Cyclic group of points:	no
Non-cyclic primes:	$2, 3$

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$1296$	$2985984$	$4822469136$	$7991974232064$	$13419432908860176$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$30$	$1774$	$69966$	$2828254$	$115828350$	$4749834958$	$194753800110$	$7984933427134$	$327382003006686$	$13422659385710254$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 46 curves (of which all are hyperelliptic):

• $y^2=16 x^6+28 x^5+3 x^4+29 x^3+38 x^2+28 x+25$
• $y^2=14 x^6+33 x^5+14 x^4+8 x^3+14 x^2+33 x+14$
• $y^2=34 x^6+25 x^5+3 x^4+26 x^3+3 x^2+25 x+34$
• $y^2=39 x^6+11 x^5+12 x^4+26 x^3+5 x^2+10 x+9$
• $y^2=10 x^6+6 x^5+25 x^4+12 x^3+36 x^2+15 x+36$
• $y^2=14 x^6+38 x^5+18 x^4+23 x^3+18 x^2+38 x+14$
• $y^2=28 x^6+8 x^5+24 x^4+40 x^3+10 x^2+38 x+10$
• $y^2=33 x^6+7 x^4+7 x^2+33$
• $y^2=12 x^6+3 x^5+36 x^4+26 x^3+32 x^2+13 x+28$
• $y^2=16 x^6+12 x^5+25 x^4+8 x^3+24 x^2+38 x+13$
• $y^2=28 x^6+32 x^4+32 x^2+28$
• $y^2=38 x^6+5 x^5+38 x^4+22 x^3+19 x^2+20 x+22$
• $y^2=24 x^6+28 x^5+10 x^4+9 x^3+4 x^2+34 x+14$
• $y^2=34 x^6+17 x^5+15 x^4+3 x^3+13 x^2+35 x+6$
• $y^2=21 x^6+16 x^5+14 x^4+7 x^3+27 x^2+16 x+20$
• $y^2=17 x^6+4 x^5+17 x^4+8 x^3+17 x^2+4 x+17$
• $y^2=23 x^6+9 x^5+29 x^4+8 x^3+17 x^2+36 x+20$
• $y^2=3 x^6+31 x^5+39 x^4+12 x^3+18 x^2+10 x+27$
• $y^2=39 x^6+18 x^5+11 x^4+15 x^3+3 x^2+x+36$
• $y^2=9 x^6+6 x^5+24 x^4+25 x^3+11 x^2+35 x+1$
• and

• $y^2=14 x^6+16 x^5+32 x^4+18 x^3+32 x^2+16 x+14$
• $y^2=17 x^6+16 x^5+x^4+40 x^3+x^2+16 x+17$
• $y^2=5 x^6+27 x^5+17 x^4+5 x^3+32 x^2+21 x+21$
• $y^2=27 x^6+11 x^5+23 x^4+24 x^3+23 x^2+11 x+27$
• $y^2=15 x^6+40 x^5+23 x^4+5 x^3+23 x^2+40 x+15$
• $y^2=16 x^6+36 x^5+8 x^4+38 x^3+8 x^2+36 x+16$
• $y^2=17 x^6+4 x^4+4 x^2+17$
• $y^2=39 x^6+17 x^5+7 x^4+35 x^3+7 x^2+17 x+39$
• $y^2=36 x^6+18 x^5+17 x^4+19 x^3+17 x^2+18 x+36$
• $y^2=29 x^6+38 x^5+37 x^4+24 x^3+20 x^2+7 x+24$
• $y^2=28 x^6+15 x^5+9 x^4+29 x^3+18 x^2+19 x+19$
• $y^2=22 x^6+40 x^5+26 x^4+36 x^3+26 x^2+40 x+22$
• $y^2=6 x^5+35 x$
• $y^2=14 x^6+19 x^4+19 x^2+14$
• $y^2=22 x^5+3 x^4+8 x^3+3 x^2+22 x$
• $y^2=8 x^6+3 x^5+29 x^4+21 x^3+35 x^2+11 x+1$
• $y^2=27 x^6+x^5+22 x^4+34 x^3+22 x^2+x+27$
• $y^2=22 x^6+34 x^5+7 x^4+16 x^3+35 x^2+30 x+3$
• $y^2=36 x^6+33 x^4+33 x^2+36$
• $y^2=28 x^6+13 x^5+24 x^4+27 x^3+24 x^2+13 x+28$
• $y^2=34 x^6+15 x^5+28 x^4+19 x^3+27 x^2+14 x+6$
• $y^2=35 x^6+38 x^4+38 x^2+35$
• $y^2=5 x^6+38 x^5+38 x^4+30 x^3+5 x^2+8 x+12$
• $y^2=28 x^6+5 x^5+2 x^4+26 x^3+4 x^2+20 x+19$
• $y^2=14 x^6+x^5+24 x^4+9 x^3+24 x^2+x+14$
• $y^2=7 x^6+38 x^5+9 x^4+18 x^3+2 x^2+12 x+12$

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{41}$

The isogeny class factors as 1.41.ag^2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-2}) \)$)$

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
2.41.a_bu	$2$	(not in LMFDB)
2.41.m_eo	$2$	(not in LMFDB)
2.41.g_af	$3$	(not in LMFDB)