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Mar
29
answered Diophantine system of two equations with four variables
Mar
8
answered Inequality between real numbers $a^ab^bc^c<(abc)^{\frac{a+b+c}{3}}$
Jan
29
answered Proving that $\sin1 $(radian) is irrational without using Taylor Series Expansion.
Jan
27
answered Can't figure out $O(n \log n)$ divide-and-conquer algorithm
Jan
27
answered Why $\sum_{j=1}^mj^p \sim m^{p+1}$ as $n\to\infty$?
Jan
27
answered nth derivative of a troublesome function
Jan
25
answered Why is this sum wrong?
Jan
13
answered Limit of a sequence of a function
Jan
12
answered For finding limits of functions, when are graphs deceiving?
Jan
12
answered How prove there exsit $M$ such $a_{n}\le M$
Jan
12
answered Sum: $\sum_{n=1}^\infty\prod_{k=1}^n\frac{k}{k+a}=\frac{1}{a-1}$
Jan
10
answered How can i prove that this function is in the given bounds?
Jan
10
answered Derivated function $f$ so that $f(x+y)=f(x)f(y)$ and $f'(x)f(y)=f(x)f'(y)$ for all $x,y \in \Bbb R$
Jan
10
answered How Many Permutations of $\{1,\ldots,n\}$ satisfy that $x_i<x_{i+2}$ and $x_i<x_{i+3}$?
Jan
10
answered Why does every “fibonacci like” series converge to $\phi$?
Jan
9
answered Question about integral of the product of two continuous functions.
Jan
8
answered Find $\sum_{k_1+\cdots+k_n=m}\frac{1}{k_1!\cdots k_n!}$.
Jan
8
answered 2N digit number with exactly N ones and N zeros. Prove there exists a number divisible by N
Jan
6
answered Closed form for a formula with a summation over $i\binom{n-i}{k-1}$, and combinatorial proof?
Jan
3
answered Finding a value from 5 systems of equations of 5 variables(CHMMC 2014)