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


May
1
comment Finite-space dynamical systems
But.. isn't the Frobenius the identity on points? Despite the nontriviality of the action on regular functions and on cohomology, I'm not sure this qualifies as a "finite dynamical system" for the OP..
May
1
revised Why is there a connection between enumerative geometry and nonlinear waves?
deleted 119 characters in body
Apr
19
revised Nash's proof of De Giorgi-Nash-Moser theorem
(spelling)
Apr
18
revised Making the identification $\tau M\approx TM\oplus (TM\odot TM)$
edited body
Apr
14
awarded  Good Question
Mar
29
asked When does an algebraic space that is a torsor over a scheme have to be a scheme?
Mar
24
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
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
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?