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

• Label: 2.71.e_fm
• Base field: $\F_{71}$
• Dimension: $2$
• $p$-rank: $1$
• Ordinary: no
• 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:	$( 1 + 71 x^{2} )( 1 + 4 x + 71 x^{2} )$
	$1 + 4 x + 142 x^{2} + 284 x^{3} + 5041 x^{4}$
Frobenius angles:	$\pm0.5$, $\pm0.576280895962$
Angle rank:	$1$ (numerical)
Jacobians:	$126$
Cyclic group of points:	no
Non-cyclic primes:	$2$

This isogeny class is not simple, primitive, not ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

$p$-rank:	$1$
Slopes:	$[0, 1/2, 1/2, 1]$

Point counts

Point counts of the abelian variety

$r$	$1$	$2$	$3$	$4$	$5$
$A(\F_{q^r})$	$5472$	$26790912$	$127818965088$	$645350204620800$	$3255386312461587552$

Point counts of the curve

$r$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$
$C(\F_{q^r})$	$76$	$5310$	$357124$	$25395806$	$1804308476$	$128101094622$	$9095114161076$	$645753497675326$	$45848501075246764$	$3255243551966191230$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 126 curves (of which all are hyperelliptic):

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

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

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{71^{2}}$.

Endomorphism algebra over $\F_{71}$

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

• 1.71.a : \(\Q(\sqrt{-71}) \).
• 1.71.e : \(\Q(\sqrt{-67}) \).

Endomorphism algebra over $\overline{\F}_{71}$

The base change of $A$ to $\F_{71^{2}}$ is 1.5041.ew $\times$ 1.5041.fm. The endomorphism algebra for each factor is:

• 1.5041.ew : \(\Q(\sqrt{-67}) \).
• 1.5041.fm : the quaternion algebra over \(\Q\) ramified at $71$ and $\infty$.

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.ae_fm	$2$	(not in LMFDB)