Time—Correlation—Function Expressions for Linear and Nonlinear Transport Coefficients

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Abstract
Construction of a statistical‐mechanical ensemble to represent a system known to be out of equilibrium is discussed. The consequences of the temperature, velocity, and chemical potential fields are formal time‐correlation‐function expressions for both linear‐ and higher‐order transport coefficients. Many different forms of correlation functions are equivalent, which permits choice of the most useful for a given purpose. Onsager‐type reciprocal relations appear to exist for only the linear coefficients.