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Questions
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What was Gödel’s real achievement?

jan 29 at 18:42 Wolfgang Mueckenheim 21●1●6

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Can anyone give me a good example of two interestingly different ordinary cohomology theories?

may 31 10 at 14:10 Roberto Frigerio 1,849●5●14

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How would one even begin to try to prove that a simple number-theoretic statement is undecidable?

jun 15 10 at 4:59 Pierre-Yves Gaillard 543●2●10●16

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How does one use the Poisson summation formula?

jun 28 10 at 11:36 Olof Sisask 41●3

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Difficult examples for Frankl’s union-closed conjecture

mar 3 at 0:17 Jérôme JEAN-CHARLES 608●7●15

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What is the state of our ignorance about the normality of pi?

jan 13 11 at 0:34 Wadim Zudilin 8,674●1●24●59

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How to recognise that the polynomial method might work

oct 26 10 at 6:17 domotorp 4,068●7●25

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How many surjections are there from a set of size n?

jun 28 10 at 20:27 Terry Tao 27.8k●4●107●178

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Improving a sequence of 1s and -1s

apr 16 10 at 18:58 Anton Petrunin 16.5k●41●110

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Partial sums of multiplicative functions

feb 5 10 at 5:08 Peter Humphries 1,683●1●10●17

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