Two lettres of the Geometrical correspondance between M. Donkin and M. Spottiswoode.
Two lettres of the Geometrical correspondance between M. Donkin and M. Spottiswoode.
J. he following is partly a simplification and partly a development of a method vvhich you once shewed me for determining two cyclie sections of a surface of the second order.If θ, μ, l, m, n, ΐ , m', ri, P, Q, R, K, be any constants (I shall suppose, …