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(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 GrothendieckTeichmuller 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 nonlinear": 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? 