Correlation and clustering
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In this lecture we clarify the basic difference between the correlation properties for systems characterized by small or large fluctuations. The concepts of correlation length, homogeneity scale, scale invariance and criticality are discussed as well. We relate these concepts to the interpretation of galaxy clsutering.
10 pages, latex, no figures, to appear proceedings of the NATO Advanced Study Institute ``Astrophysical Sources of High Energy Particles & Radiation'' Erice (Italy) 11-21 November 2000
10 pages, latex, no figures, to appear proceedings of the NATO Advanced Study Institute ``Astrophysical Sources of High Energy Particles & Radiation'' Erice (Italy) 11-21 November 2000