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 Oct11 comment Understanding direct sum of matrices Thanks. Very Helpful. Oct11 revised Elementary question in partial differentiation added 194 characters in body Oct11 accepted Elementary question in partial differentiation Oct10 asked Elementary question in partial differentiation 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 revised Understanding direct sum of matrices added 131 characters in body 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 revised Understanding direct sum of matrices added 88 characters in body Oct4 comment Understanding direct sum of matrices @Qia So it is not a direct sum? In which case my source is wrong. Oct4 asked Understanding direct sum of matrices Oct1 accepted Is the problem asking to show that $r\times \nabla \psi$ satisfies wave equation wrong? Sep30 asked Is the problem asking to show that $r\times \nabla \psi$ satisfies wave equation wrong? Sep27 comment Linear algebra question @Arturo Magidin This is the exact version. You can have a look at it here (page 13) Sep27 asked Linear algebra question Sep22 awarded Nice Question Sep21 accepted Help with volume integration 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 $r-c\cos \theta$ Sep20 revised Help with volume integration edited tags