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Similarly for f(x,y)<0 I can imagine that every polygon will be stretched down to the extreme lower part of the graph. In polar coordinates inequalities aren't that simple and hence it may be a necessary feature. Overall you may be right, it makes a aesthetics visual feature and I will consider adding it in the next version (v3.1).

Hi there. Can you please explain "highlighting under or above the curve" (and how it is done)? Even if this means what I think it does, I think it would work only for inequalities of the 'y<f(x)" type; what I have in mind are things like "f(x,y)<0" in the plane, and likewise in 3d. I also think about inequalities in polar coordinates. Anyway, aesthetics alone should be enough to justify including graphical representation of inequalities (just and opinion).

Thank you. The inequalities is something else that we've been considering. Although personally I don't see the needs since all it is, is highlighting under or above the curve. I did however receive several requests for it so it's something that hopefully I will add soon. Meanwhile feel free to post your justifications for why inequalities is important (i will give its implementation a higher priority if I'm convinced that this is a crucial feature for many).

Thanks for the reply. In the meantime, why not think about graphing 2D and 3D inequalities?

Yes Michel, we are planning to add support for both implicit functions and slider & timer based animations.
We're hoping to have them available within the next two releases (v3.1)