Top network posts

• 39 How to prove $\cos \frac{2\pi }{5}=\frac{-1+\sqrt{5}}{4}$?
• 27 thoughts about $f(f(x))=e^x$
• 18 What do prime ideals in $k[x,y]$ look like?
• 18 Prove that the limit of $\sin n$ as $n \rightarrow \infty$ does not exist
• 13 Importance of Cayley's theorem
• 13 Distinct Sylow $p$-subgroups intersect only at the identity, which somehow follows from Lagrange's Theorem. Why?
• 11 Proving that the terms of the sequence $(nx-\lfloor nx \rfloor)$ is dense in $[0,1]$.
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