MathOverflow
Johannes Hahn's user avatar
Johannes Hahn's user avatar
Johannes Hahn's user avatar
Johannes Hahn
  • Member for 13 years, 2 months
  • Last seen more than a month ago
  • Aachen, Germany
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About

Studied math, PhD, was a software developer / tech consultant for a while, returned to university as a PostDoc, now software developer again. Still a mathematician at heart.

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answer
11
How much is MathOverflow exposed to recent events on StackExchange?
Oct 12, 2019
question
7
Request: Add the option to close to review tasks from the "first questions" queue
Aug 27, 2021
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45
Fantastic properties of Z/2Z
40
Problems where we can't make a canonical choice, solved by looking at all choices at once
24
Odd digits of $2^n$
23
Is cohomology always related to topology?
20
For nonabelian finite simple $G$, does $Aut(G)$ have a unique subgroup isomorphic to $G$?

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