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 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 Apr4 answered 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 Apr2 revised Number of circuits that surround the square. added 4 characters in body Apr2 comment Number of circuits that surround the square. @DavidHolden +1 Yes. That's why we could not solve the problem with this strategy. But at least I can get a lower bound for the number of circuits. And I think with some trick I improve my lower bound. Apr2 revised Number of circuits that surround the square. edited body Apr2 revised Number of circuits that surround the square. update figure Apr2 asked Number of circuits that surround the square. Mar31 revised Intuition on Wald's equation without using the optional stopping theorem. deleted 84 characters in body Mar27 revised Why the $\nabla f(x)$ in the direction orthogonal to $f(x)$? improviment format Mar27 comment proving gradient of a scalar field is perpendicular to equipotential surface This question and this answer can give you too a direction:math.stackexchange.com/questions/401845/…