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Primary group/Secondary group - A Primary group is a typically small social group whose members share close, personal, enduring Primary relationships. These groups are marked by member's concern for one another, shared activities and culture, and long periods of time spent together.
Permutation group - In mathematics, a permutation group is a group G whose elements are permutations of a given set M, and whose group operation is the composition of permutations in G (which are thought of as bijective functions from the set M to itself); the relationship is often written as (G, ...
M96 group of galaxies - The M96 group of galaxies (also known as the Leo I group or simply the M96 group) is a physical group of galaxies in the Leo constellation consisting of Spiral Galaxy M95, Spiral Galaxy M96, Elliptical Galaxy M105, and a number of fainter galaxies. This group does not contain the Leo I dwarf ...
Hyperbolic group - In group theory, a hyperbolic group, also called negatively curved group, word-hyperbolic group, Gromov-hyperbolic group, \delta-hyperbolic group, is a finitely generated group equipped with a word metric satisfying certain properties characteristic of hyperbolic geometry.
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