Top network posts

• 116 solving $f(f(x))=g(x)$
• 94 Is the sphere the only surface all of whose projections are circles? Or: Can we deduce a spherical Earth by observing that its shadows on the Moon are always circular?
• 61 Is there a dense subset of the real plane with all pairwise distances rational?
• 59 How to solve $f(f(x)) = \cos(x)$?
• 57 Smoothness of distance function in Riemannian Manifolds
• 55 How do they verify a verifier of formalized proofs?
• 45 Is every closed set of Q² the intersection of some connected closed set of R² with Q²
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