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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.
3
votes
Accepted
How many circular cylinders through 5 general points?
If the 5 points are generic then I believe Lemma 7.1 in arXiv: 1306.2346 is relevant to your question.
The Lemma, for the case of cylinders, says if there are two cylinders that pass through the same …
2
votes
Examples of naturally occurring Quadratic forms or quadrics.
Quadratic forms occur naturally, as stress energy functions, in Bob Connelly's work on tensegrity structures.
You can find a wealth of details on his website, in particular the book http://www.math.c …