"Almost all of fluid dynamics follows from a differential equation called the Navier-Stokes equation. But this general equation has not, in practice, led to solutions of real problems of any complexity. In this sense, the curve of a baseball is not understood; the Navier-Stokes equation applied to a base ball has not been solved."
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Original Language: English
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Robert Adair The Physics Of Baseball (1990) (2nd Edition - Revised, 1994) Ch. 2, The Flight Of The baseball, p. 22.
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