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for questions on geometric invariant theory (or GIT), including stability criteria and symplectic quotients.

3 votes
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Topological criterion for GIT semistability

Let $X$ be a complex algebraic variety and $G$ a complex reductive group acting on $X$. Let $L$ be a linearization of this action, i.e. a line bundle with a linear action of $G$ covering that of $X$. …