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Published online by Cambridge University Press: 15 September 2014
Takingx horizontal, and y vertically downwards; let (x + ξ, y + η) be, at time t, the position of the particle whose position at time 0 is (x, y); let Φ denote the velocity-potential at (x, y, t); and let Ρ denote its time-integral,
note * page 41 Théoric Analytique de la Chaleur
note † page 41 Sir W. Thomson's Collected Papers, vol. ii. p. 46.
note * page 43 “Tracts” (Undalatory Theory of Optics, last page).