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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)


Nov
30
reviewed Close How many different necklaces can be made from seven black beads and three white beads?
Nov
30
reviewed Close Is $g(x) = |x^3| + 1$ even, odd, or neither?
Nov
30
reviewed Close How to find the value of the solution of a differential equation at a specific point?
Nov
30
reviewed Close Continuous, open function with respect to the usual topology
Nov
29
reviewed Reject Probability of that the global sum of n numbers digits sum is equal to…
Nov
29
reviewed Reject How to evaluate the following integral $\int_0^{\pi/2}\sin{x}\cos{x}\ln{(\sin{x})}\ln{(\cos{x})}\,dx$?
Nov
29
reviewed Approve Galerkin Method: Why Set the Residuals to Zero?
Nov
28
reviewed Close How to solve the non-linear equation $-(a+c\,e)\left(\exp(-b/(a+c\,e))-1\right)-c\,d=f$ for $c$?
Nov
28
reviewed Close Triple integration in cylindrical coordinates (obtaining the formula to integrate)
Nov
28
reviewed Close Proof that $\lim_{n\to\infty}{\sin{100n}}$ does not exist
Nov
28
reviewed Close Prove $\sum_{k=0}^n k{n\choose k}^2 = {n{2n-1\choose n-1}}$
Nov
28
reviewed Close Reworking $\sum_{n \leq x} \frac{1}{n^s}$, where $n$ is relatively prime to some fixed $k$
Nov
28
answered Show a limit of a bounded function is 0 then solving the integral
Nov
28
reviewed Close No perfect matching of k-regular graphs
Nov
28
reviewed Close k- regular graph matching
Nov
27
reviewed Reject Given a die, what is the probability that the second roll of a die will be less than the first roll?
Nov
27
reviewed Reject Does such a polynomial always exist, for any pole of a rational function?
Nov
27
reviewed Leave Open How to evaluate the integral of $\sqrt{\sin\sqrt x}\cos \sqrt x / ( 1+x^2)$?
Nov
27
reviewed Close How to find the basis?
Nov
26
reviewed Close Is the relation on integers, defined by $(a,b)\in R\iff a=5q+b$, a function?