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This tag is used if a reference is needed in a paper or textbook on a specific result.

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On the blow-up along the diagonal in a product

Let $X$ be a smooth variety and consider the diagonal $\Delta \subseteq X \times X$. It seems to be well-known that the exceptional divisor in the blow-up of $X \times X$ along $\Delta$ is isomorphic …
Chuck Hague's user avatar
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2 votes

Stratifications and Cohomology Computations

I don't know if this is the direction you're interested in, but the book "An Introduction to Intersection Homology Theory" by Kirwan and Woolf is a nice readable book that has a lot about stratificati …
Chuck Hague's user avatar
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14 votes

Elementary reference for algebraic groups

If you're interested in the theory of linear algebraic groups, Linear Algebraic Groups by Humphreys is a great book. The other two standard references are the books (with the same name) by Springer an …
Chuck Hague's user avatar
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