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Don't have much time these days...


Apr
19
answered Convergence and monotonicity of roots of $\frac{1}{1 + x - \exp(-x)} = n$
Apr
19
answered how to prove that $(1 + \frac{1}{n})^{n+1}$ is decreasing?
Apr
18
answered prove that $\frac{1-e^{-x^2}}{x}\le 2\sqrt{2} , \ x>0$,
Apr
18
answered Difficulty in understanding topological sort
Apr
18
answered Question about what it means to be in “NP”
Apr
18
answered Intuitive proofs that $\lim\limits_{n\to\infty}\left(1+\frac xn\right)^n=e^x$
Apr
17
answered Nesting of different Asymptotic operators
Apr
17
answered Solve the trigonometrical product
Apr
17
answered $\lim_{n\to\infty} \frac{1}{n} \sum_{k=1}^{n} n^{1/k} $
Apr
16
answered How to compute the asymptotic growth of $\binom{n}{\log n}$?
Apr
16
answered Different ways of computing $\sum_{n=0}^{\infty}\binom{n+7}{n}\left(\frac{1}{3}\right)^{n}$
Apr
15
answered Counting ordered triples of sets, with empty intersection.
Apr
14
answered Why isn't NP = coNP?
Apr
14
answered Median in triangle
Apr
14
answered How to prove $\sum_{d|n} \mu(d) \sigma(n / d) = n$?
Apr
14
answered Colouring a chessboard
Apr
13
answered How to find the minimum of $f(x)=(\sin(x)+\cos(x)+\tan(x)+\cot(x)+\sec(x)+\csc(x))^2$?
Apr
13
answered Induction proof of $\sum_{j=0}^n{(-1)^j{n \choose j}\prod_{k=m+1}^{m+n-1}{(j+k)}}=0$
Apr
12
answered Finding a limit where binomial coefficients appear as powers.
Apr
12
answered Finding a close formula for $\sum_{r=0}^k {k \choose r}{k \choose r-1}$