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Cluster
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=== Math and statistics === * [[Cluster analysis]], a set of techniques for grouping a set of objects based on intrinsic similarities * [[Cluster sampling]], a sampling technique used when "natural" groupings are evident in a statistical population * [[Cluster graph]], in graph theory, a disjoint union of complete graphs * Clusterable graph, in [[Balance theory#Signed graphs and social networks|balance theory]] * [[Cluster algebra]], a class of commutative rings used in representation theory * [[Cluster expansion]], a technique in statistical mechanics and quantum field theory
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