Top network posts

• 181 Is it true that $0.999999999\ldots=1$?
• 161 Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?
• 153 How to prove Euler's formula: $e^{i\varphi}=\cos(\varphi) +i\sin(\varphi)$?
• 136 Is there a general formula for solving 4th degree equations (quartic)?
• 103 Convert HTML entities to Unicode and vice versa
• 85 Proof that the irrational numbers are uncountable
• 70 Proving that $1$- and $2D$ simple symmetric random walks return to the origin with probability $1$
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