On Thursday, May 12, 2016 at 4:56:54 AM UTC-7, Ralf Stephan wrote:
>
> On Thu, May 12, 2016 at 10:48 AM mmarco <[email protected] <javascript:>>
> wrote:
>
>> But even if we implement expression.laurent_polynomial(), it wouldn't
>> automatically allow conversion from SR to LaurentPolynomialRing, would it?
>>
>
> Right, it's conversion on demand.
>
The thing that should probably be and probably is in place is:
var('x')
R=LaurentPolynomialRing(QQ,'x')
R(1+1/x)
That way the user knows exactly what to expect.
The interface that <symbolic expression>.laurent_polynomial(QQ) would
implement would be more of the type "convert into a laurent polynomial in
some suitable ring". That's very prone to unpredictable results, e.g.:
var('x,y')
(1/x+1/y).laurent_polynomial()
(1/x+1/y-1/y).laurent_polynomial()
( (x+y)/(x*y) -1/y ).laurent_polynomial()
so I would be hesitant to offer the routine in the first place.
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