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An expert is a man who has made all the mistakes, which can be made, in a very narrow field. (Niels Bohr)


Aug
24
reviewed Approve suggested edit on Why $\cos^2 x-\sin^2 x = \cos 2x\;?$
Aug
23
reviewed Leave Closed Solve inequality: $-5 < \frac{1}{x} < 0$
Aug
23
reviewed Close Number of ways to divide variables into two categories
Aug
23
reviewed Close Why must $b=0$ for this linear system to have infinitely many solutions for all $a$?
Aug
21
reviewed Approve suggested edit on Check my proof by contradiction…
Aug
20
reviewed Close A subset that is closed under multiplication but not addition?
Aug
20
reviewed Reject suggested edit on Given a Sequence ABCDEFG, what is the probability that the letters A and C , both will come after D, in all possible permutations of the sequence?
Aug
20
revised Banach Fixed Point Theorem. Measurable version.
Add my attempt.
Aug
20
reviewed Reject suggested edit on Given a Sequence ABCDEFG, what is the probability that the letters A and C , both will come after D, in all possible permutations of the sequence?
Aug
20
reviewed Reject suggested edit on Solving $xy''-(1-x)y'+y=0$
Aug
20
revised The problem of the most visited point.
deleted 1 character in body
Aug
20
reviewed Reject suggested edit on how shall i find the $n$-th term of this,
Aug
20
reviewed Edit suggested edit on Matrices over field with characteristic $p$
Aug
20
revised Matrices over field with characteristic $p$
Math mode in title.
Aug
20
reviewed No Action Needed Laws of equivalence needed to prove $\;q \leftrightarrow (¬p ∨ ¬q) ≡ (¬p ∧ q)\;?$
Aug
20
reviewed No Action Needed How do you calculate this limit $\lim_{n\to\infty}\sum_{k=1}^{n} \frac{k}{n^2+k^2}$?
Aug
20
revised Distributional derivate of $f(t)$
deleted 13 characters in body; edited title
Aug
19
comment $ 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)}? $
@900sit-upsaday Thanks for your help. However this article from the article link is not what I seek. I did not know this article. Hopefully he quotes the article or article that is cited by the try. Your information has been very helpful.
Aug
19
revised min-max polynomial approximation with sign definite error
added 35 characters in body
Aug
19
reviewed No Action Needed Do all equilibria in 2 player zero sum games have the same distribution over outcomes