On 22 Mai, 00:12, Robert Bradshaw <[email protected]>
wrote:
> Try working a multivariate ring rather than a tower of univariate  
> rings, e.g. ...

... which suggests the question why Sage does not automatically
transform a tower of polynomial rings into a single ring -- for
efficiency, and in order to avoid weird constructions such as
  sage: QQ['t']['t']['t']
  Univariate Polynomial Ring in t over Univariate Polynomial Ring in t
over Univariate Polynomial Ring in t over Rational Field

Cheers,
Simon

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