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 Apr 17 revised Definition of an Integral Domain in the second edition of Herstein's Topics in Algebra I did mean zero divisors, not non-zero divisors. Apr 16 asked Definition of an Integral Domain in the second edition of Herstein's Topics in Algebra Feb 10 comment Find $c=c(n)$ so $T = c \sum_{i=1}^{n} |X_{i}|$ is an unbiased estimator. And unbiased estimator of what? $\sigma$ ? Feb 10 comment Find $c=c(n)$ so $T = c \sum_{i=1}^{n} |X_{i}|$ is an unbiased estimator. Why do you need to calculate the variance of $T$? Feb 1 comment Show that $X_1^T[I_n - X({X^T}X)^{-1}X^T] = 0$ Note that if you can write $X_1 = XC$ for some $C$ you are done. Feb 1 revised heat equation on a surface corrected spelling Feb 1 suggested approved edit on heat equation on a surface Jan 31 accepted Matrix with maximal rank in a family of matrices Jan 30 revised Matrix with maximal rank in a family of matrices fixed grammar Jan 30 asked Matrix with maximal rank in a family of matrices Jan 26 comment Determining the convergence of $\sum (-1)^{k-1} \frac{\log k}{\sqrt{k}}$ and a more complicated series For $k > 1, \log k > 0,$ and $$k = \exp \log k = 1 + \frac{\log k}{1} + \frac{(\log k)^2}{2!} + \frac{ (\log k)^3}{3!} + \dots +$$, so, $(\log k)^3/6 \leq k$ and $\log k \leq \sqrt[3]{6k}.$ Jan 25 accepted Invariant subspace of an orthogonal operator. Jan 24 comment Invariant subspace of an orthogonal operator. This is neat. Thanks! Jan 24 revised Invariant subspace of an orthogonal operator. deleted some unecessary lines. Jan 24 comment Invariant subspace of an orthogonal operator. I will update the questions with the original argument, reference, and how I came up with this question from his argument shortly. Jan 24 comment Invariant subspace of an orthogonal operator. I have removed all references to argmax. Jan 24 revised Invariant subspace of an orthogonal operator. made sure $x_0$ is defined unambiguously Jan 24 comment Invariant subspace of an orthogonal operator. It is a $x_0$ with $\|x_0\|=1$ which maximizes $x^TAx$ over $\{x:\|x\|=1\}.$ Jan 24 asked Invariant subspace of an orthogonal operator. Jan 23 revised Set of Discontinuities for a function $f$ Changing $env to$\$ environment to make the answer render better. It was not rendering correctly on my laptop.