Top network posts

• 15 Rearranging the formula
• 11 quadratic equation solving mistake
• 8 Finding all positive real functions satisfying $xf(y)+f(f(y))\leq f(x+y)$
• 8 Find $ \frac{1}{2^2 –1} + \frac{1}{4^2 –1} + \frac{1}{6^2 –1} + \ldots + \frac{1}{20^2 –1} $
• 8 $x^3+y^3=8$ ,Number of straight lines through origin which do not meet this curve is
• 7 solve the equation in $\Bbb C $
• 7 Proving Riordan's identity that $\sum_{k=1}^{n} {n-1 \choose k-1} \frac{k!}{n^k}=1$
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