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• 53 Bijection $f\colon\mathbb{N}\to\mathbb{N}$ with $f(0)=0$ and $|f(n)-f(n-1)|=n$
• 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 $\mathbb{R}^2$
• 16 Maximal subgroups that force solvability.
• 13 Fundamental group of punctured simply connected subset of $\mathbb{R}^2$
• 12 Abundancy index and non-solvable finite groups
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