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 Mar9 comment Which function's Fourier transform is the function itself? Also, have a look at the answers here. Feb28 comment Is a good GRE score enough for a non-math graduate to be accepted in a decent pure mathematics graduate program? What comes under the purview of weak math background in your opinion? Non-math undergrad major? Math Major with weak scores? Would a non-math undergrad major (engg/physics) with strong scores in math courses count as weak? Thank you. Dec9 comment Showing two matrices are similar Sorry,you all were right. I made a type in the third matrix Dec9 comment Showing two matrices are similar @Henning Sorry. I am following a physics book and these matrices are actually representations. Two representations were defined to be equivalent if their matrices are related by a similarity transformation. This was what I had in my mind. Dec9 comment Showing two matrices are similar Yes, I am sure. The first three matrices are what physicists call spin 1 representation. The final three matrices are the adjoint representation of SU(2) (excluding a phase factor of -i). The question is to show that the two representations are equivalent (a result which is used later to construct roots). I phrased only the computational part in my question. Nov29 comment Regular polygons meeting at a point @J.M. But we're talking about polygons not polyhedrons. Oct25 comment Is there a binary spigot algorithm for log(23) or log(89)? I'm wondering why I got notified without @. Anyhow, regarding the above comment, what has your reputation got to do with it? Oct18 comment Calculating the matrix hmm... going over wikipeidia, there's another method.. to use $e^{A}Be^{-A}=B+[A,B]+\frac{1}{2!}[A,[A,B]]+\frac{1}{3!}[A,[A,[A,B]]]+\cdots$ Oct14 comment Elementary question in partial differentiation @Tyler Yes (hindi). As I wrote in chat an hour ago, it is a close approximation of my progress in mathematics. Oct11 comment Understanding direct sum of matrices Thanks. Very Helpful. Oct4 comment Understanding direct sum of matrices I do not have enough rep to make a less than 6 character edit. Could you adjust the parentheses to $A\mathbf{v}=(f(\mathbf{v}),g(\mathbf{v}))$, $B\mathbf{w}=(h(\mathbf{w}),k(\mathbf{w}))$ $A\mathbf{v}=(f(\mathbf{v}),g(\mathbf{v}))$, $B\mathbf{w}=(h(\mathbf{w}),k(\mathbf{w}))$ in the last line of third paragraph. Oct4 comment Understanding direct sum of matrices by swapping linear transformation, do you mean rearranging the rows? I did not understand the complete statement, it is a direct sum, then a rearrangement of rows, then a multiplication by what? Oct4 comment Understanding direct sum of matrices @Srivastan For the Source click the given link, click the amazon "Look Inside" feature, click on "first pages", check problem 3. Oct4 comment Understanding direct sum of matrices @Qia So it is not a direct sum? In which case my source is wrong. Sep27 comment Linear algebra question @Arturo Magidin This is the exact version. You can have a look at it here (page 13) Sep20 comment Help with volume integration Thanks for answering, how did you get: $\int_{-1}^1 \frac{(r -c t) }{ \left(r^2 + c^2 - 2 \, c \cdot r \cdot t \right)^{3/2} } \mathrm{d} t = \frac{ 1 - \operatorname{sign}(c - r ) }{r^2}$? This is where I was stuck. Sep20 comment Help with volume integration The numerator in the first integtrand is $r-c\cos \theta$ Sep18 comment Does $\lim_{x\rightarrow 0}\frac{c}{|x|}$ exist? Your calculus textbook does warn you about the case $g(x)\neq 0$ so why consider it? Sep17 comment Intuition behind this theorem in linear algebra @Arturo what do you mean by: "... vector space is free on the basis" Sep17 comment Intuition behind this theorem in linear algebra Reference: Page 95 , 2nd Ed. Page 56 in third edition, here is the preview