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seen Jan 23 at 9:54

Jul
3
comment Discrete Fourier Transform Matrix (DFT)
Thanks for the information. What is about n=5, 6,7, 8?
Jun
30
comment Expectation of an event
Thanks for the solution. It works nicely. Just one quarry. In the recursive formula of $E[k]$, why did you add 1? That is $E[k]=1 + \ldots$.
Jun
28
comment Expectation of an event
I take three random integer r,s,t in [1,1000] with replacement. And 1. Set A[r]=1 2. Set A[s]=1 if A[t]=0 3. A[t]=1 if A[s]=0.
Jun
24
comment Commutative Matrix Problem
Thanks for the details.
Jun
20
comment Commutative Matrix Problem
It is clear that polynomial in B must be commutative with B. Will you kindly explain why converse is true?
Jun
20
comment Commutative Matrix Problem
Will you kindly give the details?
Jun
19
comment Commutative Matrix Problem
Thanks for LaTeX. Yes, identity or zero matrix satisfies the condition but I want to find general form.