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Answers
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Awfully sophisticated proof for simple facts
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Interesting and Accessible Topics in Graph Theory
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Problems where we can’t make a canonical choice, solved by looking at all choices at once
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Can the Riemann hypothesis be undecidable?
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Category of categories as a foundation of mathematics
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Is the non-triviality of the algebraic dual of an infinite-dimensional vector space equivalent to the axiom of choice?
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Is there an integration free proof (or heuristic) that once differentiable implies twice differentiable for complex functions?
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Countable Unions And The Axiom Of Countable Choice
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Is there an infinite-dimensional Banach space with a compact unit ball?
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Elementary applications of Krein-Milman
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Simple Question about Category theory.
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Existence of prime ideals and Axiom of Choice.
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Under what conditions a bounded linear map can be extended ?