Yemon Choi
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Registered User
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Assistant Professor at the University of Saskatchewan. Firm believer that "they also serve who only stand and wait". Mainly working these days on abstract harmonic analysis, but always liable to fall off the wagon and into the cohomology of Banach algebras. Other interests currently include: homological perspectives on functional analysis; probabilistic methods; convolution operators arising from group actions. |
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12h |
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Taylor Series and Fourier Series Hmm, I am not sure (yet) that this needs to be rapidly shunted over to MSE. There is something lurking in the background about representation of differential operators on certain function spaces with respect to certain bases... although perhaps I am reading more into the question than the OP intended |
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14h |
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Simultaneous Linear System Why? See mathoverflow.net/howtoask |
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1d |
revised |
Banach Algebra Counterexample added some more background on BAs that embed into B(H) |
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1d |
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Banach Algebra Counterexample @jpp: over at math.stackexchange.com, please post a link back to this question here. |
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1d |
revised |
Banach Algebra Counterexample added tag, added link to MSE |
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1d |
accepted | Banach Algebra Counterexample |
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1d |
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Banach Algebra Counterexample @Owen: it is not obvious that you can't embed the group algebra into B(H) via some homomorphism that isn't a star-map. (Something like the failure of von Neumann's inequality works in the case of A(T), the example Cedric gave; this is explained in the book of Diestel, Jarchow and Tonge) |
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1d |
answered | Banach Algebra Counterexample |
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2d |
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vector balancing problem I'm not so sure he did find out from here, but I guess that he can always drop by to confirm or refute. |
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2d |
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Is there existing terminology for this technical condition on semilattices? You get a mention in the references here: arxiv.org/abs/1203.6691 |
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2d |
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Is there existing terminology for this technical condition on semilattices? @NN has been credited in the list of references for the paper where I needed this condition: arxiv.org/abs/1203.6691 |
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2d |
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Intersection of curves You could have just edited your earlier question mathoverflow.net/questions/133374/… |
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2d |
answered | Fourier series representing a continuous function? |
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2d |
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Status of Beal, Granville, Tijdeman-Zagier Conjecture I just reverted Halfdan Faber's change of the title. I think anyone looking for the conjecture with only Beal's name attached to it will not be confused by finding the extra names. Whereas omitting those names is tacitly taking Beal's side of the story, and I am not sure we should do that. |
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2d |
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To be or not to be…? In your case, I would definitely counsel suffering the slings and arrows of outrageous fortune |
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2d |
revised |
If $\chi\in\operatorname{Irr}(G)$, $N\unlhd G$, and $\langle\chi_{N},1_{N}\rangle\ne 0$, then $N\subset \operatorname{Ker}(\chi)$. corrected tags, also bumped |
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Jun 17 |
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Does this sequence of H\"older functions have a limit? If this isn't homework, why do you need the solution? |
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Jun 17 |
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If $\chi\in\operatorname{Irr}(G)$, $N\unlhd G$, and $\langle\chi_{N},1_{N}\rangle\ne 0$, then $N\subset \operatorname{Ker}(\chi)$. MSE version: math.stackexchange.com/questions/422543/… |
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Jun 17 |
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If $\chi\in\operatorname{Irr}(G)$, $N\unlhd G$, and $\langle\chi_{N},1_{N}\rangle\ne 0$, then $N\subset \operatorname{Ker}(\chi)$. Voting to close (due to stubby fingers, selectee "blatantly offensive" when I meant "no longer relevant") |
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Jun 17 |
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Finding ALL Minimal generators of a finite Group. Why "graph-theory"? |
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Jun 17 |
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If $\chi\in\operatorname{Irr}(G)$, $N\unlhd G$, and $\langle\chi_{N},1_{N}\rangle\ne 0$, then $N\subset \operatorname{Ker}(\chi)$. Also, one of your tags is wrong. |
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Jun 17 |
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If $\chi\in\operatorname{Irr}(G)$, $N\unlhd G$, and $\langle\chi_{N},1_{N}\rangle\ne 0$, then $N\subset \operatorname{Ker}(\chi)$. Since MO isn't for people to get help with assignments, please state why you need the answer to this exercise from Isaacs's book, what you have tried, and where you are stuck. mathoverflow.net/howtoask |
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Jun 17 |
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Is a free alternative to MathSciNet possible? I don't think this is intended to have the same functionality that MathSciNet currently has. Often it isn't the reviews themselves that have proved useful in short-term searching, but being able to crawl up and down the citation tree. |
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Jun 17 |
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How I can solve this functional equation Alexandre, I am not sure this question should be encouraged, see meta.mathoverflow.net/discussion/1489 |
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Jun 16 |
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inner product of two gaussian random vectors? Something which might simplify the calculations slightly (apologies if you already know this): by the rotational invariance of the standard multivariate Gaussian distribution, you can WLOG assume (since you only care about distribution) that Y=(R, 0, ... , 0) where R is the square root of a chi-squared on n degrees of freedom. Then the random variable you care about has the same distribution as RZ where Z is a standard Gaussian independent of R. |
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Jun 15 |
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Mellin Transform I took the liberty of fixing your formatting |
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Jun 15 |
revised |
How I can solve this functional equation retagged, also to bump |
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Jun 15 |
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How I can solve this functional equation Also crossposted at MSE math.stackexchange.com/questions/419525/… under username "ZE1", formerly "Chaos" |
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Jun 15 |
revised |
Mellin Transform retagged and fixed formatting |
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Jun 15 |
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How I can solve this functional equation I seem to remember this username was previously revealed as a fromt for the user RH/Zeraoulia, who was also fond of taking logs and trying to generalize the functional equation for zeta... |
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Jun 15 |
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Nearly all math classes are lecture+problem set based; this seems particularly true at the graduate level. What are some concrete examples of techniques other than the “standard math class” used at the *Graduate* level? [deleted earlier comment, which was based on a misreading of the OP] |
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Jun 14 |
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Fourier series representing a continuous function? (Probably even more is in Zygmund, but I find those books hard to carry, let alone read) |
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Jun 14 |
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Fourier series representing a continuous function? Reading through Katznelson's Intro to Harmonic Analysis will give lots of circumstantial evidence that the answer to your question is "not really, and probably not ever". Certainly it is not enough to look at the sequence $(|a_n|)$ |
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Jun 14 |
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Fourier series representing a continuous function? Mike, with all due respect, this is a condition on functions, not on the Fourier coefficients themselves. |
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Jun 14 |
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Every real-holomorphic Hamiltonian vector field on a Kähler manifold is Killing (and preserves curvature), yes? The current title of this question brings certain bits of pop culture to mind for some people, yes? en.wikipedia.org/wiki/Death%27s_Head |
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Jun 14 |
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Nearly all math classes are lecture+problem set based; this seems particularly true at the graduate level. What are some concrete examples of techniques other than the “standard math class” used at the *Graduate* level? BTW, in which country/system are you giving this course? UK-US differences, and all that. |
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Jun 13 |
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Range of the Fourier transform on L^1 Ah, yes that is simpler. Thanks, Bill |
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Jun 13 |
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Why is TopGrp the category of topological groups and continous homomorphisms protomodular? +1 for the "pedestrian version" (not that there's anything inherently wrong with the more abstract version, but it is good to see both for Brains of Little Bear like myself) |
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Jun 10 |
revised |
Quasinilpotent elements of group C-star algebras fixed broken link |
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Jun 10 |
revised |
Usage of complex moments in complex plane retagged |
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Jun 4 |
asked | reference request for character theory of p-extraspecial groups |
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Jun 4 |
revised |
Generalized bilinear estimates cleaned up LaTeX |
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Jun 2 |
awarded | ● Good Answer |
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Jun 2 |
revised |
A question about multiplier algebra of $C_0(G)\otimes C_b(G)$ for a locally compact group $G$ added OA tag |
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May 24 |
awarded | ● Nice Answer |
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May 11 |
revised |
Trace extention property added BA tag |
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May 11 |
revised |
Character amenability retagged |
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Apr 27 |
revised |
Is rigour just a ritual that most mathematicians wish to get rid of if they could? Added some formatting tweaks to emphasise Milnor's rebuttal |
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Apr 23 |
accepted | ultrapowers of Banach algebras |
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Apr 14 |
answered | Corona Theorem in several variables |
