Your problem is too many quotes! You are giving strings to F().
I would say
F=FractionField(PolynomialRing(QQ,'A'))
A-F.gen()
and then
1/A
F(1/A)
are all fine.
John
On 13/02/2008, Simon King <[EMAIL PROTECTED]> wrote:
>
> Dear Sage team,
>
> i tried the following:
> sage: F=FractionField(PolynomialRing(QQ,'A'))
> sage: A=F('A')
> sage: 1/A
> 1/A
> sage: F('1/A')
> 0 // not nice, but acceptable
> sage: R=PolynomialRing(FractionField(PolynomialRing(QQ,'A')),'x')
> sage: A=R('A')
> sage: 1/A
> Exception exceptions.RuntimeError: 'maximum recursion depth exceeded
> in cmp' in 'sage.libs.pari.gen.PariInstance.get_var' ignored
>
> Then i had to interrupt with Ctrl-C
>
> Is it possible to work in a polynomial ring over a fraction field, and
> if "yes", how?
>
> Yours
> Simon
>
> >
>
--
John Cremona
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