‎"CLIFFORD, W.K. - N-DIMENSIONAL SPACES.‎
‎On the Classification of Loci. Received April 8, - Read May 1878.‎

‎(London, Harrison and Sons, 1880). 4to. No wrappers as extracted from ""Philosophical Transactions"" 1878 - Vol. 169 - Part II. Pp. 663-681.‎

Reference : 45712

‎First printing of this paper on ""Clifford-Spaces"" is considered a classich in mathematics, - being a general study of curves it is an introduction to the study of n-dimensional space.Clifford, along with Hermann Grassmann, invented what is now termed geometric algebra, a special case being the Clifford algebras named in his honor, which are used in contemporary mathematical physics. He was the first to suggest that gravitation might be a manifestation of an underlying geometrical structure of the universe, and contributed the advancement of non-Euclidean geometry developed by Bernhard Riemann and Nikolai Ivanovich Lobachevsky. In his philosophical writings he coined the expression ""mind-stuff"". Clifford argued that energy and matter are simply different types of curvature of space. These ideas later played a fundamental role in Albert Einstein's general theory of relativity.‎