Hello,
this is certainly a bug. The error comes from (a/s**2).is_polynomial(s).
Christophe
2013/10/17 Alessandro Bernardini <alessandro.bernardini....@gmail.com>
> sage: s, a, b= var('s a b')
>
> sage: (1/s^2 + s).is_polynomial(s)
> False
> sage: (a/s^2 + b*s).is_polynomial(s)
>
> True
> sage: version()
> 'Sage Version 5.6, Release Date: 2013-01-21'
> sage:
>
> should return False ?
>
>
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