1988 IMO question 6 is usually regarded as the HARDEST question. https://www.quora.com/What-is-the-tou...

The Legend of Question 6, by Numberphile:    • The Legend of Question Six - Numberphile  

Here I present the solution that I was able to understand from Buzzorange: https://buzzorange.com/techorange/202... So good!!!

Vieta jumping:
https://brilliant.org/wiki/vieta-root...
https://en.wikipedia.org/wiki/Vieta_j...

Proof by contradiction:
sqrt(2) is irrational:    • Sqrt(2) is irrational!  (Classic Proof)  
there are infinitely many primes:    • Euclid's proof that there are infinit...  

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