6,580 reputation
257108
bio website
location
age
visits member for 5 years
seen 12 hours ago

(formerly user "unknowngoogle", and for a very short time "red herring" but that was a red herring)


2d
comment Which way for reading the proofs?
The OP is a master student in math, but I think the question (and the answer it gets) could be equally interesting for any mathematician
2d
comment Help with derivative rules
@OGLoc: I suggest you first study the chapter(s) of any elementary calculus book in which 'derivative rules' are explained, and then answer your question by yourself (yes you can!).
2d
comment Help with derivative rules
"Derived category" tag, LoL :D
Mar
22
revised Did Grothendieck write about modular forms?
added 13 characters in body
Mar
22
comment Where is a good place to start learning about the Grothendieck-Teichmuller group?
Is the word "algebroic" (perhaps related to... groupoids?) intentional or just a typo? :)
Mar
22
comment When does the sequence of iterates of a rational function converge?
By "rotation", do you mean something conjugate to $z \mapsto e^{i \theta}$ ($\theta$ irrational with $\pi$)?
Mar
22
comment When does the sequence of iterates of a rational function converge?
@G.E.: most probably given the tags, the Riemann sphere $\mathbb{CP}^1$.
Mar
22
revised why is it so cool to square numbers? (in terms of finding the standard deviation)
edited body
Mar
19
comment What is the stalk of a stack?
Oh I see what you mean. (On the other hand, if $F$ is a sheaf of modules on a $k$-scheme $X$ and $x:\mathrm{Spec}(k)\to X$ is a (closed) point, the $k$- vector space $x^{*} F$ is the fiber at $x$, not the stalk).
Mar
18
awarded  Yearling
Mar
18
comment What is the stalk of a stack?
My comment comes too late, but I have the impression that your construction actually gives the fiber, not the stalk, of whatever thing you are considering (sheaf, space, stack,...).
Mar
17
comment When does $\overline{U(0,1)}=B(0,1)$ hold?
It would be useful if you add the definiton of $U(0,1)$ and $B(0,1)$. Are they the "$< 1$" and "$\leq 1$" discs centered at the origin, respectively, I guess?
Mar
13
revised Reference Request: Fundamental Group Scheme
(added "reference request" tag)
Mar
13
comment Reference Request: Fundamental Group Scheme
@Stefan Kohl: why? It seems to me the OP is asking a legitimate reference request (I added the appropriate tag), also specifying his background. He is not asking people to write an expository article for him, or similar stuff...
Mar
10
comment Local cohomology, vanishing of cohomology for sheaves that are not $\mathcal{O}_X$-modules
@K.S., thank you.
Mar
9
comment Local cohomology, vanishing of cohomology for sheaves that are not $\mathcal{O}_X$-modules
What is $H^1_x$?
Mar
6
reviewed Reject latex tag wiki excerpt
Mar
3
comment Classification of PDE
Re "Nowadays, the interesting PDEs are non-linear": what about Schroedinger's equation? If I'm not mistaken it's linear, isn't it?
Feb
27
revised Connections on principal bundles via stacks?
deleted 48 characters in body
Feb
22
comment Hyperelliptic curve of genus 2 over R
And, aren't all genus 2 curves over any field hyperelliptic?