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This seems a good idea.
But I have an expression of type 'sage.symbolic.expression.Expression' that contains a variable s of the same type.
When I use your approach I have/handle objects of type 'sage.rings.function_field.function_field_element.FunctionFieldElement_rational' after constructing a Rational function field in s over Symbolic Ring (of type sage.rings.function_field.function_field.RationalFunctionField_with_category')
SO THE ONE s (in the expression) is NOT the s in the function field element...
If I do the conversion with K(expr) the whole expr is considered as a block and is not "parsed" for s... So when then I call denominator I always get 1
How can this be fixed/handled ?
Thanx you !
