Hi Is there any command for writing affine variety (Let k be a field, and let f1,...,fs be polynomials in k[ x1,...,xn]. Then we set V(f1,...,fs)= { (a1,...,an) ? kn : fi (a1,...,an)=0 for all 1 ?i?s } is called affine variety ) ? also how can I drew an affine variety plane such as V(x^2-y^2*z^2+z^3) ?