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<p>in three dimensions as recounted by <a href="page.php?w=Michael_J._Crowe">Michael J. Crowe</a> in <a href="page.php?w=A_History_of_Vector_Analysis">A History of Vector Analysis</a>. The study of <a href="page.php?w=Minkowski_space">Minkowski space</a> required Riemann's mathematics which is quite different from that of four-dimensional Euclidean space, and so developed along quite different lines. This separation was less clear in the popular imagination, with works of fiction and philosophy blurring the distinction, so in 1973 <a href="page.php?w=H._S._M._Coxeter">H. S. M. Coxeter</a></p><p>
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