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 Dec4 awarded Notable Question Nov16 answered Fisher information of the Rayleigh distribution Nov16 comment Fisher information of the Rayleigh distribution I did take them with respect to $x_{i}$'s. I will post the result asap. Nov16 asked Fisher information of the Rayleigh distribution Sep18 accepted Prove that a matrix is positive definite and symmetrical Sep18 comment Prove that a matrix is positive definite and symmetrical Thank you. I will try to work something out. One thing that is certain is that $X^TX$ is symmetric, because $(X^TX)^T = X^T(X^T)^T = X^TX$. By the Spectral theorem, it follows that $X^TX$ can be decomposed into matrices of eigenvectors and eigenvalues. Now I should be able to show $v^TX^TXv \geq 0$ for all vectors v I think. And thank you Karl (below) for providing the hint of transpose of $X^TX$ Sep17 asked Prove that a matrix is positive definite and symmetrical Jul2 awarded Curious May7 comment Prove that the two integrals are equal with periodic function Perfect, thank you. I need to work more with technical arguments like this rather than conceptual ones. May7 accepted Prove that the two integrals are equal with periodic function May6 asked Prove that the two integrals are equal with periodic function May3 awarded Yearling May3 comment Evaluate limits by interpreting sums as integral sums Thank you, very good answer. May3 accepted Evaluate limits by interpreting sums as integral sums May2 comment Evaluate limits by interpreting sums as integral sums What does it mean to interpret sums as integral sums. May2 asked Evaluate limits by interpreting sums as integral sums Apr5 comment Wrong way to use MVT to prove inequality Thank you all, I guess it is a good idea to REALLY understand the meaning of the MVT. I rushed to fast into doing problems. Apr5 accepted Wrong way to use MVT to prove inequality Apr4 asked Wrong way to use MVT to prove inequality Apr3 accepted Prove uniform convergence using the M-test