In algebraic geometry, Sumihiro's theorem, introduced by (Sumihiro 1974), states that a normal algebraic variety with an action of a torus can be covered by torus-invariant affine open subsets. The "normality" in the hypothesis cannot be relaxed.
In algebraic geometry, Sumihiro's theorem, introduced by (Sumihiro 1974), states that a normal algebraic variety with an action of a torus can be covered by torus-invariant affine open subsets. The "normality" in the hypothesis cannot be relaxed.
Source: Wikipedia "Sumihiro's theorem" · CC BY-SA 4.0
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