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

4 votes
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degree of pull-back via F of an hyperplane vs degree of defining polynomials of F

Let X be a nice projective variety (say, smooth and defined over the complex numbers) embedded in some projective space, and let $F:X\to\mathbb{P}^n$ be a rational map given by $[f_0:f_1:\cdots: f_n]$ …