There is no satisfactory theory of three-dimensional non-Euclidean geometry, from an intuitional point of view, unless it gives us a clear three-dimensional image in our ordinary space, assuming, of ...

P.S.—Since the above was written, I have had time to reflect further upon Prof. Hatton's book, and have read Prof. G. H. Hardy's review of in a recent number of the Mathematical Gazette. I do not ...

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Aug. 25 (UPI) --The ancient Babylonians - who lived from about 4,000 BCE in what is now Iraq - had a long forgotten understanding of right-angled triangles that was much simpler and more accurate than ...