"To define distance in their non-Euclidean geometries, Cayley and Klein proceeded by analogy with a discovery of Laguerre... who had shown that the distances and angles of ordinary Euclidean geometry can be expressed as cross ratios, in other words, that the Euclidean metric geometry is clearly a specialization of projective geometry. The concept of the "absolute" and the definition of distance unified Euclidean and non-Euclidean geometries into a single all-embracing theory."
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Edna E. Kramer, The Nature and Growth of Modern Mathematics (1970)
https://en.wikiquote.org/wiki/Unification_in_science_and_mathematics
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Unification in science and mathematics
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