# Questions tagged [polymath5]

For questions arising from topics discussed during the Polymath5 project, which tried to solve the Erdős discrepancy problem.

**13**

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482 views

### Making a character small at a reciprocal

The following question emerged from thinking about the Erdős discrepancy problem. I don't know whether an answer would be directly helpful, but it might, and in any case I find the question quite ...

**12**

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**0**answers

994 views

### A question about Mobius inversion

I don't know how precise I can make this question. I want to know whether there is a theorem that says that a certain phenomenon always happens, but I think the best I can do in order to pin down the ...

**1**

vote

**0**answers

168 views

### Difficulty understanding equivalent statement of Erdős Discrepancy Problem

Recently I watched a famous youtube video of talk given by Terry Tao on Erdős Discrepancy Problem https://www.youtube.com/watch?v=QauoO0j9Y9Y.
I never heard of this problem before his announcement of ...