Top network posts

• 53 Bijection $f\colon\mathbb{N}\to\mathbb{N}$ with $f(0)=0$ and $|f(n)-f(n-1)|=n$
• 23 Can $x^4+y^4+1$ be a perfect power?
• 22 Why is the regulator of the degree 11 extension of $\mathbb{Q}$ so large?
• 20 Abstract proof that $\lvert H^2(G,A)\rvert$ counts group extensions.
• 20 Probability of random sphere lying inside the unit ball
• 18 Fundamental group of punctured simply connected subset of $\mathbb{R}^2$
• 17 Maximal subgroups that force solvability.
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