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Suppose I have field `FF``:

``` sage: FF

Number Field in z with defining polynomial t^2+1 ```

How to programmatically check that this field is Number Field? Something like FF.is_number_field()...

Suppose I have field `FF``:

sage: FF
 
FF
Number Field in z with defining polynomial t^2+1
```

Suppose I have field `FF``:FF:

sage: FF
Number Field in z with defining polynomial t^2+1

How to programmatically check that this field is Number Field? Something like FF.is_number_field()...