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- Group_action abstract "In algebra and geometry, a group action is a description of symmetries of objects using groups. The essential elements of the object are described by a set, and the symmetries of the object are described by the symmetry group of this set, which consists of bijective transformations of the set. In this case, the group is also called a permutation group (especially if the set is finite or not a vector space) or transformation group (especially if the set is a vector space and the group acts like linear transformations of the set).A group action is an extension to the definition of a symmetry group in which every element of the group "acts" like a bijective transformation (or "symmetry") of some set, without being identified with that transformation. This allows for a more comprehensive description of the symmetries of an object, such as a polyhedron, by allowing the same group to act on several different sets of features, such as the set of vertices, the set of edges and the set of faces of the polyhedron.If G is a group and X is a set then a group action may be defined as a group homomorphism h from G to the symmetric group of X. The action assigns a permutation of X to each element of the group in such a way that the permutation of X assigned to: the identity element of G is the identity transformation of X; a product gh of two elements of G is the composition of the permutations assigned to g and h.Since each element of G is represented as a permutation, a group action is also known as a permutation representation.The abstraction provided by group actions is a powerful one, because it allows geometrical ideas to be applied to more abstract objects. Many objects in mathematics have natural group actions defined on them. In particular, groups can act on other groups, or even on themselves. Despite this generality, the theory of group actions contains wide-reaching theorems, such as the orbit stabilizer theorem, which can be used to prove deep results in several fields.".
- Group_action thumbnail Group_action_on_equilateral_triangle.svg?width=300.
- Group_action wikiPageExternalLink tr7abs.html.
- Group_action wikiPageExternalLink topgpds.html.
- Group_action wikiPageID "12781".
- Group_action wikiPageRevisionID "606264474".
- Group_action hasPhotoCollection Group_action.
- Group_action id "p/a010550".
- Group_action title "Action of a group on a manifold".
- Group_action title "Group Action".
- Group_action urlname "GroupAction".
- Group_action subject Category:Group_actions.
- Group_action subject Category:Group_theory.
- Group_action subject Category:Representation_theory_of_groups.
- Group_action subject Category:Symmetry.
- Group_action comment "In algebra and geometry, a group action is a description of symmetries of objects using groups. The essential elements of the object are described by a set, and the symmetries of the object are described by the symmetry group of this set, which consists of bijective transformations of the set.".
- Group_action label "Acción (matemática)".
- Group_action label "Action de groupe (mathématiques)".
- Group_action label "Azione di gruppo".
- Group_action label "Ação (matemática)".
- Group_action label "Działanie grupy na zbiorze".
- Group_action label "Groepswerking".
- Group_action label "Group action".
- Group_action label "Gruppenoperation".
- Group_action label "Действие группы".
- Group_action label "群作用".
- Group_action label "群作用".
- Group_action sameAs Akce_grupy_na_množině.
- Group_action sameAs Gruppenoperation.
- Group_action sameAs Acción_(matemática).
- Group_action sameAs Action_de_groupe_(mathématiques).
- Group_action sameAs Azione_di_gruppo.
- Group_action sameAs 群作用.
- Group_action sameAs 군의_작용.
- Group_action sameAs Groepswerking.
- Group_action sameAs Działanie_grupy_na_zbiorze.
- Group_action sameAs Ação_(matemática).
- Group_action sameAs m.03bzc.
- Group_action sameAs Q288465.
- Group_action sameAs Q288465.
- Group_action wasDerivedFrom Group_action?oldid=606264474.
- Group_action depiction Group_action_on_equilateral_triangle.svg.
- Group_action isPrimaryTopicOf Group_action.