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Direct action is a term for economic and political behavior in which participants use agency—for example economic or physical power—to achieve their goals. The aim of direct action is to either obstruct a certain practices (such as a government's laws or actions) or to solve perceived problems (such as social inequality). Direct action may include activities, often nonviolent but possibly violent, targeting people, groups, institutions, actions, or property that its participants deem offensive.
In sociology, social action, also known as Weberian social action, is an act which takes into account the actions and reactions of individuals (or 'agents'). According to Max Weber, "Action is 'social' insofar as its subjective meaning takes account of the behavior of others and is thereby oriented in its course." The basic concept was primarily developed in the non-positivist theory of Max Weber to observe how human behaviors relate to cause and effect in the social realm.
In mathematics, a group action on a space is a group homomorphism of a given group into the group of transformations of the space. Similarly, a group action on a mathematical structure is a group homomorphism of a group into the automorphism group of the structure. It is said that the group acts on the space or structure. If a group acts on a structure, it will usually also act on objects built from that structure. For example, the group of Euclidean isometries acts on Euclidean space and also on the figures drawn in it.