quality posts: 4
GluonConcerto wrote:To plot a circle non-parametrically you have to split it into two functions; the positive and negative root in the quadratic formula. The OP is correct that this curve couldn't be a single [non-parametric] function.
Right. A circle (x^2+y^2=1) isn't a function, but it does curve under itself. A simpler example is the graph x=y^2, which is not a function, but it can certainly be plotted.
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