# is exist a field is FunctionField() but not RationalFunctionField()?

is exist a field is FunctionField() but RationalFunctionField()?

is exist a field is FunctionField() but not RationalFunctionField()?

is exist a field is FunctionField() but RationalFunctionField()?

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1

I am not sure i understand your question, but `FunctionField()`

creates a rational funciton field (from which you can create other function fields), see this page;

```
sage: K.<x> = FunctionField(RDF)
sage: K
Rational function field in x over Real Double Field
```

0

thank you very much!

I donot know other function fields not RationalFunctionField,cound give more?

Real Field is not a RationalFunctionField? is there a polynomial?

F(RR)(t),even F(CC)(t) is RationalFunctionField.like p-adic,whether F(Qp)(t) is a RationalFunctionField?

there a word name totally_positive in Real Field ,and there a function named is_totally_positive() in Global Number Fields,the same meaning?

0

from sage.rings.function_field.function_field import is_FunctionField

is_FunctionField(RDF)

False

from sage.rings.function_field.function_field import is_RationalFunctionField

Traceback (click to the left of this block for traceback) ... ImportError: cannot import name is_RationalFunctionField

Asked: **
2013-12-22 21:55:36 -0500
**

Seen: **86 times**

Last updated: **Dec 24 '13**

Extension degree over function field

FunctionField with more than 1 variable

conversions from/to FunctionField(SR) and symbolic expression

the same function appears twice in the documentation

hot to get a functionfield'galois_group?

Elliptic curves over global function fields.

Factorization/Irreducibility of multivariate polynomials over function fields

Elliptic curves over function fields

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