Abelian variety isogeny class 2.71.am_ez over $\F_{71}$

• Label: 2.71.am_ez
• Base field: $\F_{71}$
• 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:	$\F_{71}$
Dimension:	$2$
L-polynomial:	$( 1 - 13 x + 71 x^{2} )( 1 + x + 71 x^{2} )$
	$1 - 12 x + 129 x^{2} - 852 x^{3} + 5041 x^{4}$
Frobenius angles:	$\pm0.219552767034$, $\pm0.518899318962$
Angle rank:	$2$ (numerical)
Jacobians:	$90$
Cyclic group of points:	yes

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$4307$	$25992745$	$128229726800$	$645742156808905$	$3255434494614562787$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$60$	$5156$	$358272$	$25411236$	$1804335180$	$128101343438$	$9095117026020$	$645753449393476$	$45848500509526272$	$3255243551051951876$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 90 curves (of which all are hyperelliptic):

• $y^2=61 x^6+51 x^5+62 x^4+60 x^3+12 x^2+18 x+19$
• $y^2=61 x^6+16 x^5+4 x^4+15 x^3+61 x^2+43 x+5$
• $y^2=64 x^6+7 x^5+44 x^4+30 x^3+70 x^2+3 x+19$
• $y^2=46 x^6+37 x^5+17 x^4+23 x^3+65 x^2+7 x+31$
• $y^2=9 x^6+69 x^5+11 x^4+63 x^3+46 x^2+46 x+38$
• $y^2=21 x^6+61 x^5+47 x^4+27 x^3+47 x^2+61 x+21$
• $y^2=13 x^6+17 x^5+12 x^4+44 x^3+2 x^2+59 x+64$
• $y^2=12 x^6+44 x^5+9 x^4+35 x^3+65 x^2+61 x+21$
• $y^2=26 x^6+18 x^5+28 x^4+46 x^3+22 x^2+60 x+46$
• $y^2=16 x^6+45 x^5+48 x^4+52 x^3+15 x^2+8 x+64$
• $y^2=17 x^6+43 x^5+12 x^4+35 x^3+27 x^2+18 x+35$
• $y^2=8 x^6+6 x^5+69 x^4+26 x^3+42 x^2+19 x+36$
• $y^2=69 x^6+2 x^5+52 x^4+9 x^3+22 x^2+70 x+49$
• $y^2=63 x^6+57 x^5+68 x^4+39 x^3+15 x^2+11 x+53$
• $y^2=5 x^6+65 x^5+13 x^4+54 x^3+30 x^2+18 x+8$
• $y^2=8 x^6+26 x^5+65 x^4+34 x^3+4 x^2+39 x+11$
• $y^2=19 x^6+37 x^5+37 x^4+14 x^3+67 x^2+x+33$
• $y^2=46 x^6+23 x^5+3 x^4+2 x^3+42 x^2+43 x+11$
• $y^2=x^6+22 x^5+36 x^4+65 x^3+3 x^2+11 x+3$
• $y^2=62 x^6+34 x^5+40 x^4+x^3+62 x^2+18 x+22$
• and

• $y^2=64 x^6+14 x^5+7 x^4+40 x^3+20 x^2+57 x+3$
• $y^2=45 x^6+24 x^5+12 x^4+57 x^3+40 x^2+30 x+10$
• $y^2=56 x^6+54 x^5+68 x^4+44 x^3+54 x^2+14 x+41$
• $y^2=26 x^6+55 x^5+58 x^4+33 x^3+50 x^2+70 x+47$
• $y^2=7 x^6+14 x^5+45 x^4+64 x^3+18 x^2+42 x+51$
• $y^2=4 x^6+21 x^5+53 x^4+19 x^3+23 x^2+69 x+35$
• $y^2=36 x^6+55 x^5+48 x^4+3 x^3+34 x^2+49 x+67$
• $y^2=69 x^6+65 x^5+19 x^4+35 x^3+62 x^2+57 x+1$
• $y^2=56 x^6+61 x^5+17 x^4+63 x^3+66 x^2+7 x+23$
• $y^2=44 x^6+65 x^5+43 x^4+46 x^3+17 x^2+44 x+70$
• $y^2=70 x^6+10 x^5+67 x^4+42 x^3+30 x^2+13 x+21$
• $y^2=48 x^6+41 x^5+28 x^4+10 x^3+21 x^2+63 x+38$
• $y^2=33 x^6+49 x^5+69 x^4+54 x^3+21 x^2+66 x+6$
• $y^2=47 x^6+24 x^5+41 x^4+32 x^3+16 x^2+6 x+54$
• $y^2=39 x^6+53 x^5+7 x^4+63 x^3+39 x^2+31 x+67$
• $y^2=40 x^6+17 x^5+47 x^4+18 x^3+21 x^2+22 x+31$
• $y^2=42 x^6+21 x^5+46 x^4+44 x^3+52 x^2+62 x+63$
• $y^2=56 x^6+5 x^5+32 x^4+32 x^3+40 x^2+30 x+65$
• $y^2=62 x^6+16 x^5+42 x^4+62 x^3+18 x^2+57 x+7$
• $y^2=46 x^6+55 x^5+32 x^4+13 x^3+16 x^2+33 x+53$
• $y^2=47 x^6+53 x^5+25 x^4+28 x^3+15 x^2+55 x+56$
• $y^2=10 x^6+19 x^5+63 x^4+58 x^3+45 x^2+68 x+70$
• $y^2=21 x^6+46 x^5+18 x^4+54 x^3+58 x^2+17 x+14$
• $y^2=70 x^6+21 x^5+63 x^4+19 x^3+16 x^2+5 x+69$
• $y^2=28 x^6+3 x^5+36 x^4+x^3+33 x^2+49 x+9$
• $y^2=65 x^6+46 x^5+46 x^4+24 x^3+29 x^2+35 x+57$
• $y^2=29 x^6+19 x^5+9 x^4+6 x^3+24 x^2+7 x+32$
• $y^2=43 x^6+67 x^5+6 x^4+69 x^3+68 x^2+33 x+61$
• $y^2=13 x^6+15 x^5+62 x^4+63 x^3+65 x^2+8 x+54$
• $y^2=52 x^6+x^5+37 x^4+38 x^3+65 x^2+55 x+44$
• $y^2=33 x^6+25 x^5+50 x^4+12 x^3+62 x^2+56 x+45$
• $y^2=17 x^6+22 x^5+3 x^4+17 x^3+6 x^2+13 x+65$
• $y^2=65 x^6+63 x^5+13 x^4+20 x^3+4 x^2+46 x+19$
• $y^2=34 x^6+63 x^5+47 x^4+39 x^3+26 x^2+33 x+45$
• $y^2=32 x^6+33 x^5+18 x^4+30 x^3+49 x^2+15 x+12$
• $y^2=22 x^6+26 x^5+45 x^4+20 x^3+15 x^2+25 x+67$
• $y^2=21 x^6+43 x^5+15 x^4+46 x^3+62 x^2+43 x+61$
• $y^2=29 x^6+14 x^5+27 x^4+14 x^3+5 x^2+67 x+18$
• $y^2=16 x^6+56 x^5+53 x^4+21 x^3+19 x^2+16 x+27$
• $y^2=45 x^6+16 x^5+7 x^4+65 x^3+2 x^2+39 x+62$
• $y^2=13 x^6+8 x^5+34 x^4+49 x^3+32 x^2+65 x+62$
• $y^2=18 x^6+8 x^5+70 x^4+47 x^3+28 x^2+19 x+14$
• $y^2=x^6+47 x^5+55 x^4+15 x^3+48 x^2+28 x+15$
• $y^2=70 x^6+55 x^5+10 x^4+30 x^3+8 x^2+48 x+4$
• $y^2=54 x^6+16 x^5+28 x^4+8 x^3+23 x^2+30 x+39$
• $y^2=41 x^6+25 x^5+11 x^4+63 x^3+70 x^2+36 x+22$
• $y^2=17 x^6+62 x^5+10 x^4+50 x^3+61 x^2+20 x+33$
• $y^2=62 x^6+42 x^5+65 x^4+24 x^3+58 x^2+68 x+63$
• $y^2=24 x^6+40 x^5+58 x^4+54 x^3+22 x^2+23 x+56$
• $y^2=x^6+26 x^5+56 x^4+35 x^3+65 x^2+29 x+52$
• $y^2=60 x^6+66 x^5+65 x^4+6 x^3+10 x^2+70 x+57$
• $y^2=14 x^6+24 x^5+19 x^4+35 x^3+38 x^2+7 x+2$
• $y^2=37 x^6+57 x^5+33 x^4+69 x^3+26 x^2+8 x+15$
• $y^2=46 x^6+30 x^5+34 x^4+50 x^3+56 x^2+67 x+62$
• $y^2=11 x^6+2 x^5+57 x^4+45 x^3+54 x^2+13 x+42$
• $y^2=29 x^6+41 x^5+8 x^4+69 x^3+61 x^2+57 x+48$
• $y^2=53 x^6+57 x^5+20 x^4+61 x^3+30 x^2+68 x+64$
• $y^2=28 x^6+36 x^5+46 x^4+19 x^3+59 x^2+5 x+35$
• $y^2=68 x^6+58 x^5+13 x^4+70 x^3+50 x^2+39 x+34$
• $y^2=50 x^6+25 x^5+53 x^4+31 x^3+57 x^2+46 x+48$
• $y^2=18 x^6+43 x^5+13 x^4+18 x^3+60 x^2+56 x+24$
• $y^2=13 x^6+11 x^5+67 x^4+24 x^3+17 x+9$
• $y^2=x^6+7 x^5+29 x^4+44 x^3+47 x^2+19 x+2$
• $y^2=59 x^6+31 x^5+25 x^4+6 x^3+50 x^2+15 x+43$
• $y^2=33 x^6+28 x^5+47 x^4+52 x^3+58 x^2+48 x+53$
• $y^2=18 x^6+6 x^5+55 x^4+7 x^3+41 x^2+48 x+14$
• $y^2=45 x^6+65 x^5+51 x^4+66 x^3+32 x^2+31 x+37$
• $y^2=3 x^6+16 x^5+42 x^4+42 x^3+55 x^2+2 x+10$
• $y^2=70 x^6+64 x^5+3 x^4+19 x^3+25 x^2+6 x+27$
• $y^2=69 x^6+3 x^5+19 x^4+63 x^3+54 x^2+3 x+18$

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{71}$.

Endomorphism algebra over $\F_{71}$

The isogeny class factors as 1.71.an $\times$ 1.71.b and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

• 1.71.an : \(\Q(\sqrt{-115}) \).
• 1.71.b : \(\Q(\sqrt{-283}) \).

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
2.71.ao_fz	$2$	(not in LMFDB)
2.71.m_ez	$2$	(not in LMFDB)
2.71.o_fz	$2$	(not in LMFDB)