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Apr
23
reviewed Approve What is cosine to the power of zero?
Apr
17
revised Proof on the inequality involving matrix splitting and trace operator
Language problems correction.
Apr
15
revised Evaluating: $I_1 = \sin^{-1} \left(\sqrt{\frac{x}{x+a}}\;\right) $
added 10 characters in body; edited title
Apr
11
awarded  Nice Question
Apr
5
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
Apr
5
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
Apr
4
revised When a function contains a sequence, and how to find the function's limit?
better clarification of the equalities used
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/…