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

• Label: 2.71.ac_fi
• Base field: $\F_{71}$
• Dimension: $2$
• $p$-rank: $2$
• Ordinary: yes
• Supersingular: no
• Simple: yes
• Geometrically simple: yes
• Primitive: yes
• Principally polarizable: yes
• Contains a Jacobian: yes

Invariants

Base field:	$\F_{71}$
Dimension:	$2$
L-polynomial:	$1 - 2 x + 138 x^{2} - 142 x^{3} + 5041 x^{4}$
Frobenius angles:	$\pm0.438494431152$, $\pm0.523368104508$
Angle rank:	$2$ (numerical)
Number field:	4.0.1931600.1
Galois group:	$D_{4}$
Jacobians:	$72$
Cyclic group of points:	no
Non-cyclic primes:	$2$

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:	$2$
Slopes:	$[0, 0, 1, 1]$

Point counts

Point counts of the abelian variety

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$5036$	$26811664$	$128241845756$	$645325007469824$	$3255172462242651676$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$70$	$5314$	$358306$	$25394814$	$1804189950$	$128101217698$	$9095123082010$	$645753487668414$	$45848500559056726$	$3255243552412759554$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 72 curves (of which all are hyperelliptic):

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

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

Decomposition and endomorphism algebra

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

Endomorphism algebra over $\F_{71}$

The endomorphism algebra of this simple isogeny class is 4.0.1931600.1.

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.c_fi	$2$	(not in LMFDB)