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falagar
  • Member for 15 years, 3 months
  • Last seen more than 8 years ago
  • St. Petersburg, Russia
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85
If $AB = I$ then $BA = I$
67
Problems known to be in both NP and coNP, but not known to be in P
64
Prove that $\sum\limits_{k=1}^{n-1}\tan^{2}\frac{k \pi}{2n} = \frac{(n-1)(2n-1)}{3}$
37
Distinct numbers in multiplication table
32
How are we able to calculate specific numbers in the Fibonacci Sequence?