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

• Label: 2.71.y_kr
• 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:	$( 1 + 9 x + 71 x^{2} )( 1 + 15 x + 71 x^{2} )$
	$1 + 24 x + 277 x^{2} + 1704 x^{3} + 5041 x^{4}$
Frobenius angles:	$\pm0.679331255589$, $\pm0.849356034550$
Angle rank:	$2$ (numerical)
Jacobians:	$84$
Isomorphism classes:	240
Cyclic group of points:	no
Non-cyclic primes:	$3$

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

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$7047$	$25305777$	$127740010608$	$645996385589625$	$3255182974169385327$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$96$	$5020$	$356904$	$25421236$	$1804195776$	$128100271822$	$9095118550656$	$645753582234916$	$45848500129927224$	$3255243553810987180$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 84 curves (of which all are hyperelliptic):

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

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

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{71}$

The isogeny class factors as 1.71.j $\times$ 1.71.p 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.j : \(\Q(\sqrt{-203}) \).
• 1.71.p : \(\Q(\sqrt{-59}) \).

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.ay_kr	$2$	(not in LMFDB)
2.71.ag_h	$2$	(not in LMFDB)
2.71.g_h	$2$	(not in LMFDB)