Fermion
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Registered User
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I am a math PhD student in the US.
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Jun 14 |
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Is Bir$(X)$ trivial if there does not exists $Y$ birational to $X$? @Angelo, Yves You are totally right. In fact the question is not of the form I actually want to solve. Please let me think for a bit to modify my question accordingly. |
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Jun 14 |
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Is Bir$(X)$ trivial if there does not exists $Y$ birational to $X$? You are right. Of course I mean birational to $X$ but not isomorphic $X$. I corrected. Thank you for pointing out mistake. |
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Jun 14 |
revised |
Is Bir$(X)$ trivial if there does not exists $Y$ birational to $X$? added 27 characters in body |
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Jun 14 |
asked | Is Bir$(X)$ trivial if there does not exists $Y$ birational to $X$? |
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Jun 3 |
revised |
A question on existence of degeneration of Enriques surface. deleted 23 characters in body |
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Jun 2 |
awarded | ● Critic |
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Jun 1 |
asked | A question on existence of degeneration of Enriques surface. |
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Jun 1 |
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The central fiber of this family of surfaces? It should be $tB-C^2$. Thank you for pointing out the typo. |
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Jun 1 |
revised |
The central fiber of this family of surfaces? typo corrected |
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Jun 1 |
asked | The central fiber of this family of surfaces? |
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Apr 22 |
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Is $\pi_1(\widetilde{X/G})$ always finite if $\pi_1(X)$ is finite? Thank you for the nice answer, Francesco. I was a bit surprised to know that my question was not as easy as I had initially expected. |
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Apr 21 |
asked | Is $\pi_1(\widetilde{X/G})$ always finite if $\pi_1(X)$ is finite? |
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Mar 21 |
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Stability of $T_{\mathbb{P}^2}$ and $\Omega_{\mathbb{P}^2}$? Thank you for the answer, but could you explain a bit more? I don't know why it is enough to check $H^0(T_{\mathbb{P}^2}(-2))=0$. I am not familiar with this field. |
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Mar 21 |
asked | Stability of $T_{\mathbb{P}^2}$ and $\Omega_{\mathbb{P}^2}$? |
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Feb 27 |
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Geometric treatment of the Ward-Takahashi identity Could you explain what you mean by Ward-Takahashi identity in your question, please? |
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Feb 22 |
awarded | ● Yearling |
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Feb 11 |
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Lifting a birational map of $X/G$ to a birational map of $X$? Doesn't your example have fixed locus $f=0$? |
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Jan 19 |
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Are rational sections of a vector bundle useful? Thank ou for the answer. |
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Jan 17 |
asked | Are rational sections of a vector bundle useful? |
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Dec 28 |
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What do correlation functions compute in CFT? @Kelly What is "moment" of the partition function? |
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Dec 28 |
awarded | ● Nice Question |
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Dec 28 |
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What do correlation functions compute in CFT? Thank you for the detailed answer providing physic background. I don't fully understand your answer, but now get a feeling about what CFT try to understand. |
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Dec 28 |
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What do correlation functions compute in CFT? Thank you for the answer, Igor. I am now happy to know that holomorphicity may be interpreted as a field equation. May I ask what the fields $\phi(z)$ and $J(z)$ stands for in this context? Is $\langle0| J(z)J(w)|0\rangle$ the amplitude to observe a particle at $z$ after a particle is created at $w$ or something? |
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Dec 28 |
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What do correlation functions compute in CFT? @Jeff I would rather want to know the physical interpretation. It would be nice if you could provide an answer. By the way, I don't know if there is any "purely mathematical interpretation" of correlation function. |
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Dec 28 |
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What do correlation functions compute in CFT? @user1540 My question is a bit vague. I would like to know both the complex coordinates and the physical meaning of $J(z)$, and they must be related. My problem is that I don't have any intuition behind what I am computing. |
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Dec 27 |
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Motivation of Virasoro algebra Thanks you for letting us know the projective representation point of view. That makes sense. |
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Dec 27 |
asked | What do correlation functions compute in CFT? |
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Dec 27 |
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Motivation of Virasoro algebra I don't quite understand what you try to mean in the second comment. I would appreciate it if you could post a bit more detail as an answer. |
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Dec 27 |
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Motivation of Virasoro algebra Thanks for your writing "why $c=D$" above. |
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Dec 27 |
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Motivation of Virasoro algebra Thank you for the answer, Chris. May I ask why multiplication by the unit vector is related to the space dimension? |
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Dec 27 |
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Motivation of Virasoro algebra @Abdelmalek Thanks for pointing out the typo. |
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Dec 26 |
asked | Motivation of Virasoro algebra |
