Correlation function (quantum field theory): Difference between revisions

Revision as of 12:06, 15 February 2023

Revision as of 12:07, 15 February 2023

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<math display="block">\text{cov}(X,Y) = \mathbb{E}[(X-\mathbb{E}[X])(Y-\mathbb{E}[Y])]</math>

where $\mathbb{E}[X]$ and $\mathbb{E}[Y]$ are the means of $<math>X$</math> and $<math>Y$</math>, respectively. The covariance measures the extent to which $X$ and $Y$ vary together.