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Liu and Ma begin with an old observation that any Feynman integral with a given number of loops can be written as a linear combination of certain other “master” integrals with the same number of loops.

Liu and Ma then invoke a second old theorem that allows them to write the derivative of each master integral as a linear combination of the same master integrals.

Because if it's just a linear combination of a few factors that source my content — which, for example, could be recency, and how many of my friends have engaged with this article, and a preference that I have, for sports or something — that could be displayed.

They then use a linear combination of these principle components and patterns to identify an individual EP-El Niño centre for each climate model.

These fits are for illustration purposes; the actual model maximized the cross-correlation of PSTHs by aligning them to a linear combination of tpress, trelease, and f.