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sounds_sound · 4667 days ago · link ·
aren't some of those solids, and not surfaces?
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riemannman · 4667 days ago · link ·
No, these are all surfaces. The ones that look like solids are actually just the surfaces of the solid. For example, the "cube" which is defined by x^6y^6z^6=1, if you wanted the whole solid, you would have to put it as x^6y^6z^6 is less than or equal to 1. Otherwise, even the point (0,0,0) doesn't belong.
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