crf

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visits member for 1 year, 7 months
seen Apr 22 at 22:32
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1d
 awarded  Nice Question
Apr
22
 accepted Is a broken clock right twice a day?
Apr
22
 comment Are the eigenvalues of $AB$ equal to the eigenvalues of $BA$? (Citation needed!)
I know this is an ancient thread but hopefully you're still lurking out there somewhere. How come you need to hope that $\lambda\ne 0$? Doesn't the argument still work just fine in the case where $\lambda=0$?
Apr
22
 comment Is there a nice way to interpret this matrix equation that comes up in the context of least squares
@Dolma thanks I fixed that
Apr
22
 revised Is there a nice way to interpret this matrix equation that comes up in the context of least squares
deleted 8 characters in body
Apr
21
 asked Is there a nice way to interpret this matrix equation that comes up in the context of least squares
Apr
19
 accepted Proving that if $f_n \rightarrow f$ uniformly and $f_n$ is integrable then $\int_a^b f_n d\alpha\rightarrow \int_a^b fd\alpha$
Apr
19
 comment Proving that if $f_n \rightarrow f$ uniformly and $f_n$ is integrable then $\int_a^b f_n d\alpha\rightarrow \int_a^b fd\alpha$
almost want to delete this question in shame.
Apr
19
 comment Proving that if $f_n \rightarrow f$ uniformly and $f_n$ is integrable then $\int_a^b f_n d\alpha\rightarrow \int_a^b fd\alpha$
oh my god......
Apr
19
 asked Proving that if $f_n \rightarrow f$ uniformly and $f_n$ is integrable then $\int_a^b f_n d\alpha\rightarrow \int_a^b fd\alpha$
Apr
16
 accepted Why do we need $A$ to have linearly independent columns in order for $P_A=A(A^TA)^{-1}A^T$ to hold?
Apr
16
 comment Why do we need $A$ to have linearly independent columns in order for $P_A=A(A^TA)^{-1}A^T$ to hold?
@Suugaku No I know, I just don't know why it has to be a basis
Apr
16
 asked Why do we need $A$ to have linearly independent columns in order for $P_A=A(A^TA)^{-1}A^T$ to hold?
Apr
5
 comment Prove that if $\sum c_n e^{inx}$ converges in $L^2$ to $f$ then $c_n$ are the Fourier coefficients.
I don't see how you got the very first step. How are you able to say that $c_n$ is equal to that? Where, for instance, does the $\frac{1}{2\pi}$ come from?
Apr
5
 asked Prove that if $\sum c_n e^{inx}$ converges in $L^2$ to $f$ then $c_n$ are the Fourier coefficients.
Apr
5
 comment Prove that the limit of the inner product is equal to the inner product of the limits in $L^2$
Do you know how I can show that that first inequality holds for this norm? I know that any norm satisfies that, but I haven't necessarily proven that this is a norm and I don't have that as a theorem.
Apr
5
 revised Prove that the limit of the inner product is equal to the inner product of the limits in $L^2$
changed title
Apr
5
 asked Prove that the limit of the inner product is equal to the inner product of the limits in $L^2$
Apr
3
 accepted Why is MATLAB giving me these weird eigenvectors?
Apr
3
 asked Why is MATLAB giving me these weird eigenvectors?
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