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 Jun 19 suggested approved edit on Find an invertible matrix $P$ and a diagonal matrix $D$ such that $D=P^{−1}AP$? Jun 19 comment How to evaluate the following integral? $\int \ln(e^x + c)~\mathrm dx$ When faced with $\int f(e^x)\,\mathrm{d}x$, try transform it into $\int u^{-1}f(u)\,\mathrm{d}u$. Jun 19 comment Clarification on optimization problem I think for any $\alpha_k$, the objective function is linear. Given that the constraint is also linear, the optimum lies in some corner point. Since $\alpha_5=1$ violates the constraint, so $\alpha_5=0$. May 17 awarded Yearling Apr 20 comment Givens rotation and retraction mapping Thanks. I am fine with the QR/polar decomposition and exponential mapping, but I am not clear about the part of Givens rotation in the text. Also, any references for the "closest" property of polar decomposition? Apr 19 asked Givens rotation and retraction mapping Apr 9 awarded Notable Question Mar 25 accepted Generic points as coefficients of polynomial kernels? Mar 24 revised Generic points as coefficients of polynomial kernels? edited title Mar 24 asked Generic points as coefficients of polynomial kernels? Feb 18 comment Homework problem on continuity I think differentiability implies continuity. Jan 23 comment $QQ$-plot - Why do we choose the empirical distribution $F_n(x) = \frac {\#\{y \in S \mid y \le x\}} n$, $S$ is sample, for comparison with normal? Just to mention that there is another SE site for statistics: stats.stackexchange.com Jan 23 comment Correspondence between an order of rational function field and a Dedekind cut Thanks. Then where does the $a$ come from? It seems to me that $X>_{\mathbb{R}(x)}x\iff X-x>_{\mathbb{R}(x)}0\iff -x >_\mathbb{R}0 \iff x<_\mathbb{R} 0$. Jan 23 asked Correspondence between an order of rational function field and a Dedekind cut Jan 15 answered Mnemonic for cross product Jan 8 comment How prove this inequality $(a^2+bc^4)(b^2+ca^4)(c^2+ab^4) \leq 64$ Maybe different patterns of lines, if that's convenient for you. Jan 8 comment Set of critical points of polynomial: why finite When you say a polynomial defined on $\mathbb{R}^n$, does it mean a multivariate polynomial with $n$ variables? Jan 8 comment How prove this inequality $(a^2+bc^4)(b^2+ca^4)(c^2+ab^4) \leq 64$ Can you use other colors? Since many people have protanopia or protanomaly (like me). Jan 7 revised Solve linear algebra expressions 3x3 -> 3\times 3 Jan 7 suggested approved edit on Solve linear algebra expressions