Top network posts

• 43 Can a discrete set of the plane of uniform density intersect all large triangles?
• 39 A curious identity related to finite fields
• 37 A limit involving binomial coefficients: $\lim_{n\to\infty} (-1)^n\sum_{k=1}^n(-1)^k{n\choose k}^{-1/k}=\frac12$?
• 36 An explicit example of a finitely presented group containing a subgroup isomorphic to $(\mathbb Q,+)$.
• 31 Which power series have bounded integral coefficients and have an inverse given by a series having bounded integral coefficients
• 30 Useful tricks in experimental mathematics
• 23 Explanation why $x,y,z$ are always variables
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