Group

• In mathematics,group isset together withbinary operation satisfying certain algebraic conditions. See group (mathematics).
• In astronomy,group issmall numbergalaxies (up50 or so) thatnear each other, likeLocal Group, which isgroupgalaxies we live in. See groupsclustersgalaxies.
• In chemistry,groupeither
  • column inperiodic tablechemical elements; see periodic table group
  • functional entity consistingcertain atoms whose presence providescertain property tomolecule, e.g.methyl group; see Functional group.
• In sociology,group involvessub-set ofculture or ofsociety: see group (sociology).

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