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Daniel's user avatar
Daniel's user avatar
Daniel
  • Member for 7 years, 4 months
  • Last seen this week
7 votes
Accepted

How to calculate $\lim_{n \to \infty} \int_{[n,n+1)} f(x) dx$ if $f\in L^1(\mathbb{R})$

6 votes
Accepted

Hartshorne's definition of very ample sheaves

5 votes
Accepted

some questions about open affine cover

5 votes
Accepted

Is there an algebraic condition on a map of rings which classifies whether the induced map on spectrum is closed?

5 votes
Accepted

Proof that set is a submanifold

5 votes
Accepted

Morphisms from an open set of an affine variety to a projective space

4 votes
Accepted

Is the module sum presheaf a sheaf?

4 votes
Accepted

About the Zariski topology on the spectrum of localization

4 votes
Accepted

Prove/disprove $\{M\in GL_n({\mathbb{C}}) | M^T=M^{-1}\}$ is a group

4 votes

Does $(L-\lambda I )=0$ mean that $\lambda$ must be an eigenvalue?

4 votes
Accepted

Subsheaves and stalks

4 votes
Accepted

Folland 2.22 absolute value of Lebesgue integral less than integral of absolute value

4 votes
Accepted

Asymptotic Riemann-Roch formula with exceptional divisor involved

4 votes
Accepted

$r$-fold cover of an elliptic curve

3 votes
Accepted

Why does the MMP terminates when the canonical divisor is nef?

3 votes
Accepted

Sum of pullbacks of SNC divsors again SNC?

3 votes

For any open set $U\subset X$, $X$ an integral scheme, $p\in U$, $\mathscr O_{X}(U)\rightarrow \mathscr O_{X,p}$ is injective

3 votes
Accepted

Classical Nullstellensatz implies Hilbert Nullstellensatz

3 votes
Accepted

A question in the book of Kollar and Mori

3 votes
Accepted

When is a nef line bundle big

3 votes
Accepted

Realizing a finite group as a scheme

3 votes
Accepted

Is a locally free sheaf of finite rank a projective object?

3 votes
Accepted

Why can $(f)\ge -D_0$ conclude that $f$ gives a global section of $\mathscr L(D_0)$ whose divisor of zeros is $D$?

3 votes

If $i: U \to Z$ is an open embedding of schemes, and $\rho: Y \to Z$ is any morphism of schemes, how do we know $U \times_Z Y = \rho^{-1}(U)$?

3 votes
Accepted

Boundary of a set is subset of the set if and only if the set is closed

3 votes
Accepted

Total Derivative & Maximum Directional Derivative & dx

3 votes
Accepted

Prove that $\mathbb{Z}_9$ is a local ring

3 votes
Accepted

Hartshorne Chapter 2 Exercise 5.6. d)

3 votes
Accepted

Does quasi-isomorphic complexes of sheaves give the same cohomology groups?

3 votes
Accepted

An example of coherent sheaf

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