Properties

Label 2.79.e_du
Base field $\F_{79}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple no
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{79}$
Dimension:  $2$
L-polynomial:  $( 1 - 6 x + 79 x^{2} )( 1 + 10 x + 79 x^{2} )$
  $1 + 4 x + 98 x^{2} + 316 x^{3} + 6241 x^{4}$
Frobenius angles:  $\pm0.390409785279$, $\pm0.690177289346$
Angle rank:  $2$ (numerical)
Jacobians:  $512$
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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6660$ $40093200$ $243005930820$ $1517370454656000$ $9467991040714143300$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $84$ $6422$ $492876$ $38956798$ $3076963764$ $243086096342$ $19203922402476$ $1517108876799358$ $119851595407890324$ $9468276082613351702$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 512 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{79}$.

Endomorphism algebra over $\F_{79}$
The isogeny class factors as 1.79.ag $\times$ 1.79.k and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:

Base change

This is a primitive isogeny class.

Twists

Below is a list of all twists of this isogeny class.

TwistExtension degreeCommon base change
2.79.aq_ik$2$(not in LMFDB)
2.79.ae_du$2$(not in LMFDB)
2.79.q_ik$2$(not in LMFDB)