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answered 2015-05-25 08:34:11 +0100
Something like that
sage: P.<x,y,z> = PolynomialRing(QQ) sage: I=P.ideal(x*x+y*y-1) sage: implicit_plot(QQ['x,y'](I.gens()[0]),(x,-2,2),(y,-2,2))
maybe ?