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details he left out. When it comes to verifiability, I did not quote a source of statements such as that the equation of a circular cone is quadratic or that the intersection of a quadratic surface and a plane is a quadratic curve or that a finite quadratic curve is an ellipse or that an axis of symmetry of an ellipse is its major or minor axis.
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I (Peter Ungar) replaced the material copied from
Mathworld by a reference to that page. Instead, I put in a reference to Roger Penrose's original publication of his non-illuminable smooth 2 and 3 dimensional regions, which can be accessed without charge. Penrose's explanation is sketchy, so I added
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This entry is copied from the
Wolfram Research page. But the process of cutting and pasting left out all reference to the Tokarsky solution. What this article says about the Penrose elliptical solution is not true, and contradicts the caption to the illustration of this solution. The description
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Peter Ungar, please stop edit warring to replace the article with your version. Check the page history: the article was not just material copied from
Mathworld, but instead the collaboration of multiple users over a period of many years. The article's previous version
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Mathworld cites D. Castro for the 24 sided room. But outside of
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reinstated your version that completely replaces the collaborative work of other users on this article.
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in the text is true of the
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had proper wikiformatting, images, and many references.
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