Properties

Label 2.79.a_abm
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:  $( 1 - 14 x + 79 x^{2} )( 1 + 14 x + 79 x^{2} )$
  $1 - 38 x^{2} + 6241 x^{4}$
Frobenius angles:  $\pm0.211343260462$, $\pm0.788656739538$
Angle rank:  $1$ (numerical)
Jacobians:  $456$

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

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $6204$ $38489616$ $243088112124$ $1517968871654400$ $9468276076859377404$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $80$ $6166$ $493040$ $38972158$ $3077056400$ $243088768726$ $19203908986160$ $1517108722031998$ $119851595982618320$ $9468276071091907606$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 456 curves (of which all are hyperelliptic):

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{79^{2}}$.

Endomorphism algebra over $\F_{79}$
The isogeny class factors as 1.79.ao $\times$ 1.79.o and its endomorphism algebra is a direct product of the endomorphism algebras for each isotypic factor. The endomorphism algebra for each factor is:
Endomorphism algebra over $\overline{\F}_{79}$
The base change of $A$ to $\F_{79^{2}}$ is 1.6241.abm 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-30}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.79.abc_nq$2$(not in LMFDB)
2.79.bc_nq$2$(not in LMFDB)
2.79.a_bm$4$(not in LMFDB)

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

TwistExtension degreeCommon base change
2.79.abc_nq$2$(not in LMFDB)
2.79.bc_nq$2$(not in LMFDB)
2.79.a_bm$4$(not in LMFDB)
2.79.ao_en$6$(not in LMFDB)
2.79.o_en$6$(not in LMFDB)