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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

7 votes
1 answer
670 views

Intuition for Luna's Étale Slice Theorem

I am trying to understand the intuition for Luna's Étale Slice Theorem in the affine setting over $\mathbb{C}$. Here is the setup. Let $X$ be an affine algebraic variety and $G$ a reductive group acti …
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1 vote

How do we define the type of a singularity on a cubic surface?

A reference is the following paper: J.W. Bruce and C.T.C. Wall. "On the classification of cubic surfaces", J. London Math. Soc. 19 (1979) no. 2, 245–256, https://doi.org/10.1112/jlms/s2-19.2.245
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