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In algebraic geometry, a torus action on an algebraic variety is a group action of an algebraic torus on the variety. A variety equipped with an action of a torus T is called a T-variety. In differential geometry, one considers an action of a real or complex torus on a manifold.
A normal algebraic variety with a torus acting on it in such a way that there is a dense orbit is called a toric variety.
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