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 2d comment A min-max problem and convex optimization problem. +1Interesting. But I have to think better of the geometric intuition of Lagrange multipliers to restrictions inequality. 2d comment A min-max problem and convex optimization problem. But the theorem of Lagrandge multiplier applies only to restrictions equally. It does not make sense to apply the theorem of Lagrange multipliers to restrictions inequality. 2d asked A min-max problem and convex optimization problem. May13 answered $d(x,y)^2 \le d(x,z)^2 - d(y,z)^2\color{}{+\varphi\big(x,y,z,d(x,y),d(y,z) \big)}?$ May2 comment Number of circuits that surround the square. see also another related question here. May2 comment The problem of the most visited point. see also another related question here. Apr27 revised Existence and uniqueness theorems for ODE. Log-Lipschitz regularity. added 3 characters in body; edited tags Apr27 comment Why $\int_{\mathbb R^n}e^{-\sum_{i=1}^n x_i^2} \, dx_1\cdots dx_n=\omega_{n-1}\int_0^\infty e^{-r^2}r^{n-1} \, dr$ Did you mean that $\sum_{i=1}^1 x_i^2=1$ rather than $\sum_{i=1}^1 x_i=1$ ? Apr27 comment Why $\int_{\mathbb R^n}e^{-\sum_{i=1}^n x_i^2} \, dx_1\cdots dx_n=\omega_{n-1}\int_0^\infty e^{-r^2}r^{n-1} \, dr$ Did you mean that $\omega_{n-1}$ is the area of surface rather than $\omega_{n-1}$ be the surface? Apr23 reviewed Approve What is cosine to the power of zero? Apr17 revised Proof on the inequality involving matrix splitting and trace operator Language problems correction. Apr15 revised Evaluating: $I_1 = \sin^{-1} \left(\sqrt{\frac{x}{x+a}}\;\right)$ added 10 characters in body; edited title Apr11 awarded Nice Question Apr5 revised If $f$ is a continuous function such that $|f(x+y)-f(x)-f(y)|$ is bounded and $f(n)=o(n)$, then $f$ is bounded added 55 characters in body Apr5 answered If $f$ is a continuous function such that $|f(x+y)-f(x)-f(y)|$ is bounded and $f(n)=o(n)$, then $f$ is bounded Apr4 revised When a function contains a sequence, and how to find the function's limit? better clarification of the equalities used Apr4 revised If $\lim_{x\to0} f(x)+g(x)$ and $\lim_{x\to0} f(x)g(x)$ exist simultaneously, are there any $f(x)$ and $g(x)$ that do not have limit deleted 310 characters in body Apr4 revised If $\lim_{x\to0} f(x)+g(x)$ and $\lim_{x\to0} f(x)g(x)$ exist simultaneously, are there any $f(x)$ and $g(x)$ that do not have limit added 80 characters in body Apr4 revised If $\lim_{x\to0} f(x)+g(x)$ and $\lim_{x\to0} f(x)g(x)$ exist simultaneously, are there any $f(x)$ and $g(x)$ that do not have limit added 152 characters in body Apr4 revised If $\lim_{x\to0} f(x)+g(x)$ and $\lim_{x\to0} f(x)g(x)$ exist simultaneously, are there any $f(x)$ and $g(x)$ that do not have limit added 124 characters in body