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sheafification construction in Hartshorne

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#algebraic-geometry #sheaf-theory
122
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Fulton 8.17 ¿$\Gamma(X) = k$?

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#algebraic-geometry #algebraic-curves
1.1k
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generalized Euler exact sequence

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#algebraic-geometry
53
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The interplay between projective and affine varieties.

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#algebraic-geometry
373
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Categories and the direct image functor

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#algebraic-geometry #category-theory #self-learning #sheaf-theory
156
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Is Spec ($k[x_1,x_2,\ldots])$ a smooth $k$-scheme?

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#algebraic-geometry #commutative-algebra #schemes
1.6k
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Genus of intersection of two surfaces in $\mathbb{P}^3$

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#algebraic-geometry
115
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What is the $\pi_1$-action on the hom-sheaf between two finite etale covers?

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#algebraic-geometry #algebraic-topology #covering-spaces
57
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Zariski-open subset in $\mathbb{C}^n$ to Zariski-closed subset in $\mathbb{C}^{n+1}$

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#general-topology #algebraic-geometry
161
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What happens when you drop "étale" from the construction of étale fundamental groups

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#algebraic-geometry #etale-cohomology
53
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Why is the function defined by $f(x_1,x_2)=0$ when $x_1=0$, and $x_2$ when $x_1\neq 0$ not regular?

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#functions #algebraic-geometry
51
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The vector bundle of an hypersurface

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#algebraic-geometry
74
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About the holomorphic vector field tangent to a divisor

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#algebraic-geometry
11.7k
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Quick question: Chern classes of Sym, Wedge, Hom, and Tensor

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#algebraic-geometry #surfaces #vector-bundles #characteristic-classes #holomorphic-bundles
1.2k
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A particular example of a non-reduced scheme (with a reduced ring of global sections)?

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#algebraic-geometry #schemes

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