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• 39 Does there exist a continuous function $f: \Bbb R\to \Bbb R$ that is rational at (Lebesgue) almost every irrational, and irrational at every rational?
• 19 Are there common inequivalent definitions of Cartan subalgebra of a real Lie algebra?
• 19 Can two different topological spaces cover each other?
• 18 What good is the phrase "Taylor series"?
• 16 Does the "how old is the shepherd" phenomenon occur for more relatable word problems?
• 13 Best book on axiomatic set theory.
• 12 Is geodesic distance equivalent to "norm distance" in $SL_n(\mathbb{R})$?
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