Invariants
| Base field: | $\F_{79}$ |
| Dimension: | $2$ |
| L-polynomial: | $1 - 8 x + 129 x^{2} - 632 x^{3} + 6241 x^{4}$ |
| Frobenius angles: | $\pm0.294217793764$, $\pm0.548683571503$ |
| Angle rank: | $2$ (numerical) |
| Number field: | \(\Q(\sqrt{-255 +24 \sqrt{5}})\) |
| Galois group: | $D_{4}$ |
| Jacobians: | $320$ |
| Cyclic group of points: | yes |
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
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ |
|---|---|---|---|---|---|
| $A(\F_{q^r})$ | $5731$ | $40180041$ | $243426838336$ | $1517123814183945$ | $9468543399597448771$ |
| $r$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
|---|---|---|---|---|---|---|---|---|---|---|
| $C(\F_{q^r})$ | $72$ | $6436$ | $493728$ | $38950468$ | $3077143272$ | $243087324766$ | $19203892683768$ | $1517108748849028$ | $119851596972360672$ | $9468276088934144356$ |
Jacobians and polarizations
This isogeny class is principally polarizable and contains the Jacobians of 320 curves (of which all are hyperelliptic):
- $y^2=70 x^6+29 x^5+21 x^4+37 x^3+66 x^2+60 x+46$
- $y^2=15 x^6+51 x^5+74 x^4+20 x^3+31 x^2+56 x+5$
- $y^2=49 x^6+28 x^5+29 x^4+32 x^3+8 x^2+10 x+75$
- $y^2=17 x^6+32 x^5+70 x^4+28 x^3+48 x^2+52 x+52$
- $y^2=32 x^6+46 x^5+30 x^4+25 x^3+19 x^2+63 x+11$
- $y^2=52 x^6+6 x^5+23 x^4+26 x^3+55 x^2+11 x+57$
- $y^2=43 x^6+41 x^5+41 x^4+75 x^3+58 x^2+50 x+13$
- $y^2=16 x^6+22 x^5+75 x^4+71 x^3+23 x^2+27 x+58$
- $y^2=46 x^6+29 x^5+35 x^4+30 x^3+46 x^2+12 x+46$
- $y^2=77 x^6+32 x^5+35 x^4+19 x^3+26 x^2+52 x+29$
- $y^2=19 x^6+31 x^5+76 x^4+29 x^3+61 x^2+43 x+34$
- $y^2=16 x^6+16 x^5+57 x^4+41 x^3+49 x^2+53 x+53$
- $y^2=5 x^6+24 x^5+61 x^4+55 x^3+73 x^2+29 x+65$
- $y^2=40 x^6+57 x^5+20 x^4+75 x^3+70 x^2+35 x+58$
- $y^2=77 x^6+65 x^5+4 x^4+74 x^3+38 x^2+55$
- $y^2=60 x^6+23 x^5+77 x^4+34 x^3+22 x^2+47 x+65$
- $y^2=60 x^6+24 x^5+43 x^4+55 x^3+52 x^2+40 x+54$
- $y^2=47 x^6+37 x^5+21 x^4+35 x^3+66 x^2+6 x+46$
- $y^2=22 x^6+27 x^5+26 x^4+4 x^3+20 x^2+61 x+41$
- $y^2=64 x^6+70 x^5+78 x^4+70 x^3+11 x+34$
- and 300 more
Decomposition and endomorphism algebra
All geometric endomorphisms are defined over $\F_{79}$.
Endomorphism algebra over $\F_{79}$| The endomorphism algebra of this simple isogeny class is \(\Q(\sqrt{-255 +24 \sqrt{5}})\). |
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 |
|---|---|---|
| 2.79.i_ez | $2$ | (not in LMFDB) |