- sage: J = random_eja()
- sage: x = J.random_element()
- sage: (not x.operator().is_invertible()) or (
- ....: x.operator().inverse()(J.one()) == x.inverse() )
+ sage: J = random_eja() # long time
+ sage: x = J.random_element() # long time
+ sage: (not x.operator().is_invertible()) or ( # long time
+ ....: x.operator().inverse()(J.one()) # long time
+ ....: == # long time
+ ....: x.inverse() ) # long time