Top network posts

• 171 Is it true that $0.999999999\dots=1$?
• 151 Why $\sqrt{-1 \times {-1}} \neq \sqrt{-1}^2$?
• 145 How to prove Euler's formula: $e^{i\varphi}=\cos(\varphi) +i\sin(\varphi)$?
• 128 Is there a general formula for solving 4th degree equations (quartic)?
• 95 Convert HTML entities to Unicode and vice versa
• 80 Proof that the irrational numbers are uncountable
• 63 Proving that 1- and 2-d simple symmetric random walks return to the origin with probability 1
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