Top network posts

• 15 When is $\displaystyle\sum_{i=1}^n a_i^{-2}=1$?
• 10 Find $a,b$ for which $xyz+z=a,\quad xyz^2+z=b,\quad x^2+y^2+z^2=4$ has unique solution
• 10 Rearrangement Inequality
• 7 Maximising shortest path passing through $n$ points inside a bounded region
• 7 How do you derive the formula of $\sin (a+b)$ from $\cos(a+b)=\cos(a)\cos(b)-\sin(a)\sin(b)$
• 6 What is the remainder when $1^6 + 2^6 + 3^6 + ... + 99^6 + 100^6$ is divided by 5?
• 5 Find the maximum of the $S=|a_1-b_1|+|a_2-b_2|+\cdots+|a_{31}-b_{31}|$
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