ASKSAGE: Sage Q&A Forum - Individual question feedhttp://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Mon, 23 Dec 2013 00:17:08 -0600is exist a field is FunctionField() but not RationalFunctionField()?http://ask.sagemath.org/question/10855/is-exist-a-field-is-functionfield-but-not-rationalfunctionfield/is exist a field is FunctionField() but RationalFunctionField()?Sun, 22 Dec 2013 21:55:36 -0600http://ask.sagemath.org/question/10855/is-exist-a-field-is-functionfield-but-not-rationalfunctionfield/Answer by cjsh for <p>is exist a field is FunctionField() but RationalFunctionField()?</p>
http://ask.sagemath.org/question/10855/is-exist-a-field-is-functionfield-but-not-rationalfunctionfield/?answer=15851#post-id-15851thank 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?Mon, 23 Dec 2013 00:11:43 -0600http://ask.sagemath.org/question/10855/is-exist-a-field-is-functionfield-but-not-rationalfunctionfield/?answer=15851#post-id-15851Answer by tmonteil for <p>is exist a field is FunctionField() but RationalFunctionField()?</p>
http://ask.sagemath.org/question/10855/is-exist-a-field-is-functionfield-but-not-rationalfunctionfield/?answer=15858#post-id-15858I 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](http://www.sagemath.org/doc/reference/function_fields/sage/rings/function_field/function_field.html);
sage: K.<x> = FunctionField(RDF)
sage: K
Rational function field in x over Real Double Field
Sun, 22 Dec 2013 23:20:15 -0600http://ask.sagemath.org/question/10855/is-exist-a-field-is-functionfield-but-not-rationalfunctionfield/?answer=15858#post-id-15858Answer by cjsh for <p>is exist a field is FunctionField() but RationalFunctionField()?</p>
http://ask.sagemath.org/question/10855/is-exist-a-field-is-functionfield-but-not-rationalfunctionfield/?answer=15859#post-id-15859from 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
Mon, 23 Dec 2013 00:17:08 -0600http://ask.sagemath.org/question/10855/is-exist-a-field-is-functionfield-but-not-rationalfunctionfield/?answer=15859#post-id-15859