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Answers
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Awfully sophisticated proof for simple facts
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What are some mathematical concepts that were (pretty much) created from scratch and do not owe a debt to previous work?
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Theorems that are ‘obvious’ but hard to prove
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Proofs without words
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Interesting Calculus Questions/Exercises
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What are some proofs of Godel’s Theorem which are *essentially different* from the original proof?
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Questions regarding “second and higher-order-undecidability”
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Continuous Measurement in Quantum Mechanics
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Most ‘unintuitive’ application of the Axiom of Choice? (2)
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Does the fact that this vector space is not isomorphic to its double-dual require choice?
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Colloquial catchy statements encoding serious mathematics
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Intersection Probabilities for Random Walk in d>2
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Improved versions of discontinuous functions
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How is the Ising model an example of a lattice model as per Kontsevich?