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Letter "D" » differential equation
«Science is a differential equation. Religion is a boundary condition.»
«If God has made the world a perfect mechanism, He has at least conceded so much to our imperfect intellect that in order to predict little parts of it, we need not solve innumerable differential equations, but can use dice with fair success»
«Thus the partial differential equation entered theoretical physics as a handmaid, but has gradually become mistress.»

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