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 Jul 3 comment Discrete Fourier Transform Matrix (DFT) Thanks for the information. What is about n=5, 6,7, 8? Jul 2 revised Problem in Matrix edited tags Jul 2 asked Problem in Matrix Jul 1 asked Discrete Fourier Transform Matrix (DFT) 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 30 asked Help need in Mathematica or Sage Jun 28 awarded Editor Jun 28 revised Expectation of an event added 126 characters in body Jun 28 asked Expectation of an event 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 25 asked Expectation of an event 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 awarded Student Jun 19 comment Commutative Matrix Problem Thanks for LaTeX. Yes, identity or zero matrix satisfies the condition but I want to find general form. Jun 19 asked Commutative Matrix Problem