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 Oct 4 comment Understanding direct sum of matrices @Qia So it is not a direct sum? In which case my source is wrong. Oct 4 asked Understanding direct sum of matrices Oct 1 accepted Is the problem asking to show that $r\times \nabla \psi$ satisfies wave equation wrong? Sep 30 asked Is the problem asking to show that $r\times \nabla \psi$ satisfies wave equation wrong? Sep 27 comment Linear algebra question @Arturo Magidin This is the exact version. You can have a look at it here (page 13) Sep 27 asked Linear algebra question Sep 22 awarded Nice Question Sep 21 accepted Help with volume integration Sep 20 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. Sep 20 comment Help with volume integration The numerator in the first integtrand is $r-c\cos \theta$ Sep 20 revised Help with volume integration edited tags Sep 20 revised Help with volume integration added 121 characters in body Sep 20 asked Help with volume integration Sep 19 awarded Nice Question Sep 18 accepted Linear Algebra Problem Sep 18 revised Linear Algebra Problem deleted 1 characters in body Sep 18 asked Linear Algebra Problem Sep 18 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? Sep 17 comment Intuition behind this theorem in linear algebra @Arturo what do you mean by: "... vector space is free on the basis" Sep 17 comment Intuition behind this theorem in linear algebra Reference: Page 95 , 2nd Ed. Page 56 in third edition, here is the preview