Summary: Geometry to 1900
Such have been the transformations in geometry between the 1840s, when we last took stock, and 1900 that it seems advisable to pass it briefly under review before moving to some final considerations. In Chapter 13, we looked at Möbius’s algebraic version of projective geometry and his introduction of barycentric coordinates. All of projective geometry was thereby turned into algebra, including the line at infinity in the projective plane, and projective transformations.
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