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 Nov9 comment What an Hermitian power of a normal matrix say about the original matrix? @dan, your argument is circular. $(QDQ^{-1})^{*} = QDQ^{-1}$ relies on $A$ being Hermitian. If $A$ is normal, then it may have complex eigenvalues, so $D^{*} \neq D$. Nov9 comment Calculate periodicity in 1-dimensional array with noise Here's a tutorial on correlations in Mathematica. It's late here, so I don't have time to write up a complete answer. Nov8 comment How to solve integral in Mathematica? @George, my apologies for not getting back to you sooner. I have a couple of questions. Why should $H$ be diagonal? I don't see any reason, a priori, why it should be. So, I'd check to see that c[n,m], h, and g are giving you what you expect. If not, let me know what you expect them to be, and we'll see if we can get them there. Nov4 comment How to solve integral in Mathematica? @George, give me several hours to get back to this. I'll take a look at it then. Nov4 comment How to solve integral in Mathematica? @George, looking at the terms in H for all $p=q$ between $5$ and $12$, they add identically to zero. For a lot of the other values of $p$ and $q$, all of the terms are identically equal to zero. Nov4 answered How to solve integral in Mathematica? Nov3 comment Determine $z^n+z^{-n}$ if $z+\frac{1}{z}=-2\cos{x}$ I'm assuming $x \in \mathbb{R}$? Nov3 awarded Civic Duty Oct29 comment Definite integral using the method of residues I believe you meant to have $\frac{1}{u^2}$ inside the middle integral in line 3? Oct25 revised Example of a simple pole added align environment to bring formula within bounding box Oct25 suggested approved edit on Example of a simple pole Oct25 revised What is the math behind the game Spot It? added latex markup. Oct25 suggested approved edit on What is the math behind the game Spot It? Oct24 revised Evaluating the limit $y \to 0^+$ added latex to title Oct24 suggested approved edit on Evaluating the limit $y \to 0^+$ Oct14 revised Need some help settling a bet added latex markup Oct14 suggested approved edit on Need some help settling a bet Oct10 comment Fourier transform integral Have you tried spherical coordinates? Oct10 comment An optimization problem involving orthogonal matrices @hardmath, you and Shiyu are both correct about my solution. For some reason, I though it could be moved like a matrix. Oct9 revised Mathematica - How to solve for the equilibrium? added code and latex markup and adjusted spacing for clarity