“The n-point correlation functions have proved useful not only as descriptive statistics but also as dynamic variables in the Newtonian theory of the evolution of clustering. ... The functions are generalized to mass correlation functions in position and momentum, and the BBGKY hierarchy of equations for their evolution is derived. This yields a new way to analyze the evolution of mass clustering in an expanding universe.”

—  Jim Peebles

[The Large-scale Structure of the Universe, 1980, Princeton Universe Press, xii, https://books.google.com/books?id=O_BPaHFtX1YC&pg=PR12]

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Jim Peebles5
Canadian-American astronomer 1935

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