Group

Contents 1 Mathematics 2 Science 3 Business 4 Sociology 5 Computing and the internet 6 Military 7 Other uses 8 See also

A group is a number of things or persons being in some relation to one another.

Mathematics

• Group (mathematics), a set together with a binary operation satisfying certain algebraic conditions
  • Group theory, the study of groups
  • Group action, a way of describing the symmetries of objects using groups
  • Group isomorphism, a one-to-one correspondence (function) between two groups which respects the given group operations
  • Group object, a kind of generalization of a group which is built on more complicated structures than sets

Science

Chemistry

• Functional group, a functional entity consisting of certain atoms whose presence provides a certain property to a molecule
• Group (periodic table), a column in the periodic table of chemical elements

Biology

• Cultivar group, a formal classification category in the International Code of Nomenclature for Cultivated Plants (ICNCP)
• Group selection, in evolutionary biology, the idea that alleles can become fixed or spread in a population because of the benefits they bestow upon groups of organisms

Cosmology

• Galaxy groups and clusters, a small number of galaxies near each other
  • Local Group, the group containing the Milky Way Galaxy

Other

• Group delay and phase delay
• a set of lenses stacked together
• Group (stratigraphy), in geology, a lithostratigraphical unit; a group consists of formations, or rock strata.

Business

• Business group, a legal entity comprising several companies

Sociology

• Social groups, a description of various human groups
  • Peer group
  • Working group
  • Interest group
• Group action (sociology)
• Group behaviour
• Group dynamics
• Group narcissism

Computing and the internet

• Group (computing), a collection of users or other objects
  • Group identifier (Unix)
• Group editor, a program that allows many people to edit a shared document over a computer network
• Usenet newsgroup

Military

• Army group
• Group (air force), an air force formation
• Group Captain

Other uses

• Breed Groups (dog), the group or category to which breeds of dogs are assigned by kennel clubs
• Group (auto racing), a category of car allowed to compete in auto racing.
• Group insurance covering people with common characteristics
• A musical ensemble:
  • Boy band
  • Girl group
  • Groupies

See also

• Grouping (disambiguation)
• The Group (disambiguation)
• Functional group (disambiguation)

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