Top network posts

• 13 Conjecturing when $M$ is good
• 10 USA TST 2018/P1: Prove that the $n^{\text{th}}$ smallest positive integer relatively prime to $n$ is at least $\sigma(n)$
• 10 Book recommendation : Olympiad Combinatorics book
• 10 Prove that if lines $FP$ and $GQ$ intersect at $M$, then $\angle MAC = 90^\circ$.
• 9 Find odd primes $p$ and $q$ such that $(p-1)\mid {3q-1}$ and $(q-1)\mid{3p-1}$.
• 9 why $\left(\left( \left(-\frac{1}{4}\right)^{-2}\right)^\frac{1}{4}\right) \neq \left(\left(-\frac{1}{4}\right)^{-\frac{1}{2}}\right)$?
• 9 CGMO 2020: Prove that $X, P, Q, Y$ are concyclic.
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