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• 30 Who introduced the Principle of Mathematical Induction for the first time?
• 14 How did Poincaré discover the fundamental group?
• 11 Can every even integer greater than four be written as a sum of two twin primes?
• 10 Is it true that Euler didn't prove $\sum_{n=1}^{\infty}\frac{1}{n^2}=\frac{\pi^2}{6}$?
• 6 Prove Cauchy-Schwarz equality.
• 6 Is there any other constant which satisfy Euler formula?
• 6 With what kind of proof was the Binet formula derived for the first time?
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