On 11/3/07, Nick Alexander <[EMAIL PROTECTED]> wrote:
> Also, is there a way to return a
> new ring just like the old one but with different names?
Yes, that should work like this (and currently does):
sage: K.<a> = NumberField(x^2 + 1)
sage: K.change_names('b')
Number Field in b with defining polynomial x^2 + 1
Though the function name isn't systematic!
sage: R.<x> = QQ[]
sage: R.change_var('b')
Univariate Polynomial Ring in b over Rational Field
And for multivariate polynomials there's nothing.
This would be a good trac ticket.
I think using "change_names" is best, since it's the same
as in Magma.
William
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