Define a polynomial ring in other polynomials

asked 2018-05-09 13:00:29 -0500

Better give a concrete example : let's say I want to define in Sage the ring $k[XY-Z^2,X+Y] \subset k[X,Y,Z]$ where $k$ is some field. Sounds like a very basic task but after reading the documentation I couldn't find how to do that.

Thanks !

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