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Apr
4
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
Apr
4
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
Apr
4
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
Apr
4
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
Apr
4
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
Apr
2
revised Number of circuits that surround the square.
added 4 characters in body
Apr
2
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.
Apr
2
revised Number of circuits that surround the square.
edited body
Apr
2
revised Number of circuits that surround the square.
update figure
Apr
2
asked Number of circuits that surround the square.
Mar
31
revised Intuition on Wald's equation without using the optional stopping theorem.
deleted 84 characters in body
Mar
27
revised Why the $\nabla f(x)$ in the direction orthogonal to $f(x)$?
improviment format
Mar
27
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/…
Mar
27
comment Why gradient vector is perpendicular to the plane
See this question and may answer: math.stackexchange.com/questions/401845/…
Mar
27
awarded  Fanatic
Mar
26
reviewed Approve How can I find out the center of mass of thin plate in the shape of a rectangle?
Mar
22
reviewed Leave Open Arxiv - what should I expect
Mar
22
reviewed Close High School Students Publishing Mathematics
Mar
22
reviewed Close What makes Probability so difficult to get it right in the first place?
Mar
22
reviewed Close Need advice. How relearn what Ive forgotten?