# Elias

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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)

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 Nov30 reviewed Close How many different necklaces can be made from seven black beads and three white beads? Nov30 reviewed Close Is $g(x) = |x^3| + 1$ even, odd, or neither? Nov30 reviewed Close How to find the value of the solution of a differential equation at a specific point? Nov30 reviewed Close Continuous, open function with respect to the usual topology Nov29 reviewed Reject Probability of that the global sum of n numbers digits sum is equal to… Nov29 reviewed Reject How to evaluate the following integral $\int_0^{\pi/2}\sin{x}\cos{x}\ln{(\sin{x})}\ln{(\cos{x})}\,dx$? Nov29 reviewed Approve Galerkin Method: Why Set the Residuals to Zero? Nov28 reviewed Close How to solve the non-linear equation $-(a+c\,e)\left(\exp(-b/(a+c\,e))-1\right)-c\,d=f$ for $c$? Nov28 reviewed Close Triple integration in cylindrical coordinates (obtaining the formula to integrate) Nov28 reviewed Close Proof that $\lim_{n\to\infty}{\sin{100n}}$ does not exist Nov28 reviewed Close Prove $\sum_{k=0}^n k{n\choose k}^2 = {n{2n-1\choose n-1}}$ Nov28 reviewed Close Reworking $\sum_{n \leq x} \frac{1}{n^s}$, where $n$ is relatively prime to some fixed $k$ Nov28 answered Show a limit of a bounded function is 0 then solving the integral Nov28 reviewed Close No perfect matching of k-regular graphs Nov28 reviewed Close k- regular graph matching Nov27 reviewed Reject Given a die, what is the probability that the second roll of a die will be less than the first roll? Nov27 reviewed Reject Does such a polynomial always exist, for any pole of a rational function? Nov27 reviewed Leave Open How to evaluate the integral of $\sqrt{\sin\sqrt x}\cos \sqrt x / ( 1+x^2)$? Nov27 reviewed Close How to find the basis? Nov26 reviewed Close Is the relation on integers, defined by $(a,b)\in R\iff a=5q+b$, a function?