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 g...
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http://en.wikipedia.org/wiki/Group_action
[sociology] In sociology, a group action is a situation in which a large number of agents take action simultaneously in order to achieve a common goal; their actions are usually coordinated. Group action will often take place when social agents realise they are more likely to achieve their goal when acting together rather than individually....
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http://en.wikipedia.org/wiki/Group_action_(sociology)
[
n] - action taken by a group of people
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http://www.webdictionary.co.uk/definition.php?query=group%20action
noun action taken by a group of people
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https://www.encyclo.co.uk/local/20974
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