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 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/… Mar27 comment Why gradient vector is perpendicular to the plane See this question and may answer: math.stackexchange.com/questions/401845/… Mar27 awarded Fanatic Mar26 reviewed Approve How can I find out the center of mass of thin plate in the shape of a rectangle? Mar22 reviewed Leave Open Arxiv - what should I expect Mar22 reviewed Close High School Students Publishing Mathematics Mar22 reviewed Close What makes Probability so difficult to get it right in the first place? Mar22 reviewed Close Need advice. How relearn what Ive forgotten? Mar22 reviewed Close Ray line intersection question Mar22 reviewed Close Intuition - Divisibility results - If c divides some integers, then c divides any linear combination of them. Mar22 reviewed Close What languages to learn for maths? Mar22 reviewed Close easy activity to train finding pattern ability?