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Problem: Add spaces: ...hispapersonthree-dimensionalalgebraiccurves(1907)andonpseudosphericalthree-dimensionalspace(1885),wheretheimpossibilityofputtingsuchaspaceintoEuclideanfour-dimensionalspaceandthepossibilityofitsbeingplacedinaEuclideanfive-dimensionalspaceareproved.

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