# Torsion subgroups of Jacobian over fields bigger than rationals.

I am interested to compute: ``torsion subgroups of Jacobian abelian variety J_0(p^2) defined over fields bigger than rationals."

The command: Upto p=11 it is fine after that if you give

```
J0(169).qbar_torsion_subgroup().field_of_definition()
```

gives the error:

```
``AttributeError Traceback (most recent call last)
<ipython-input-1-0f46a1a51624> in <module>()
1 A = J0(Integer(169))
2 A.qbar_torsion_subgroup()
----> 3 A.field_of_definition()
4 J0(Integer(169)).qbar_torsion_subgroup().field_of_definition()"
```

Can somebody kindly tell me why Sage can compute upto p=11?

The error you posted does not result from the preceding code. In particular, the code which is in error calls

`.field_of_definition()`

on`A = J0(169)`

instead of on`A.qbar_torsion_subgroup()`

.