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• 50 Is there a function whose antiderivative can be found but whose derivative cannot?
• 30 Is it possible to characterize completeness of a normed vector space by convergence of Neumann series?
• 25 Measurability of an a.e. pointwise limit of measurable functions.
• 23 On clarifying the relationship between distribution functions in measure theory and probability theory
• 21 Is the characteristic polynomial of a matrix $\det(\lambda I-A)$ or$ \det(A-\lambda I)$?
• 20 Does a connected countable metric space exist?
• 19 If a function is Riemann integrable, then it is Lebesgue integrable and 2 integrals are the same?
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