"The theory of binary forms and the projective geometry of systems of points on a conic are one and the same, i.e., to every proposition concerning binary forms corresponds a proposition concerning such systems of points, and vice versa. ... Elementary plane geometry and the projective investigation of a quadric surface with reference to one of its pointa are one and the same."
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as translated by M. W. Haskell: (quote from pp. 223–224)
https://en.wikiquote.org/wiki/Felix_Klein
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