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seen Oct 8 at 3:32

Learning from scratch.


Oct
11
comment Understanding direct sum of matrices
Thanks. Very Helpful.
Oct
11
revised Elementary question in partial differentiation
added 194 characters in body
Oct
11
accepted Elementary question in partial differentiation
Oct
10
asked Elementary question in partial differentiation
Oct
4
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.
Oct
4
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?
Oct
4
revised Understanding direct sum of matrices
added 131 characters in body
Oct
4
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.
Oct
4
revised Understanding direct sum of matrices
added 88 characters in body
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