# Properties

 Label 1.25.ak Base Field $\F_{5^{2}}$ Dimension $1$ Ordinary No $p$-rank $0$ Principally polarizable Yes Contains a Jacobian Yes

## Invariants

 Base field: $\F_{5^{2}}$ Dimension: $1$ L-polynomial: $( 1 - 5 x )^{2}$ Frobenius angles: $0$, $0$ Angle rank: $0$ (numerical) Number field: $$\Q$$ Galois group: Trivial Jacobians: 1

This isogeny class is simple and geometrically simple.

## Newton polygon

This isogeny class is supersingular. $p$-rank: $0$ Slopes: $[1/2, 1/2]$

## Point counts

This isogeny class contains the Jacobians of 1 curves, and hence is principally polarizable:

 $r$ 1 2 3 4 5 6 7 8 9 10 $A(\F_{q^r})$ 16 576 15376 389376 9759376 244109376 6103359376 152587109376 3814693359376 95367412109376

 $r$ 1 2 3 4 5 6 7 8 9 10 $C(\F_{q^r})$ 16 576 15376 389376 9759376 244109376 6103359376 152587109376 3814693359376 95367412109376

## Decomposition and endomorphism algebra

Endomorphism algebra over $\F_{5^{2}}$
 The endomorphism algebra of this simple isogeny class is the quaternion algebra over $$\Q$$ ramified at $5$ and $\infty$.
All geometric endomorphisms are defined over $\F_{5^{2}}$.

## 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 1.25.k $2$ 1.625.aby 1.25.f $3$ (not in LMFDB) 1.25.af $6$ (not in LMFDB)