Kirill's profile - activity

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2014-08-21 22:00:55 +0200	commented answer	How does one add new variables to a multivariate polynomial ring? Thank you. I think I can't upvote due to not having any reputation.
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2014-08-21 21:29:35 +0200	asked a question	How does one add new variables to a multivariate polynomial ring? If I try this, it fails: `R.<x,y> = PolynomialRing(QQ, 'x, y') R.extend_variables('z') AttributeError: 'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomialRing_libsingular' object has no attribute 'extend_variables'` (But a univariate polynomial ring `PolynomialRing(QQ, 'x')` has an `extend_variables` function.) How do I take a polynomial ring $R$ and make a new ring $R'$ with more variables, such that $R\subset R'$?