Question: Suppose that the diffusion coefficient of a substance is D = f(c). Show that c(x, t) satisfies the equation at ac = D +

Suppose that the diffusion coefficient of a substance is D = f(c). 

Suppose that the diffusion coefficient of a substance is D = f(c). Show that c(x, t) satisfies the equation at ac = D + g x (c) . where g = f'(c).

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