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A correlation function is a statistical correlation between random variables at two different points in space, time, or other parameter space, usually as a function of the variable distance between these points. In QFT, field autocorrelation functions are propagators, so use the "propagator" tag, instead.

A correlation function is a statistical correlation between random variables at two different points in space, time, or other parameter space, usually as a function of the variable distance between these points. For random variables representing the same quantity at two different points, one considers autocorrelation functions; for different random variables, cross-correlation functions. In QFT, field autocorrelation functions are propagators, so use the "propagator" tag, instead.

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