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What is meant by "linear" in non-equilibrium thermodynamics?

A differential equation is said to be linear if it can be written in the form: $ a_n(t)\frac{d^nx}{dt^n}+a_{n-1}(t)\frac{d^{n-1}x}{dt^{n-1}}+\cdots+a_1(t)\frac{dx}{dt}+a_0(t)x=g(t) $ where each coef …
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