User Ben Wieland - MathOverflow Meta

Ben Wieland

Member for 13 years, 3 months
Last seen more than 2 years ago

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Mar 14

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Jun 27, 2015
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42

Does $\mathbb C\mathbb P^\infty$ have a group structure?

37

Natural examples of sequences of adjoint functors

26

Does there exist a closed manifold that can be given both a Euclidean and a Hyperbolic structure?

25

A "meta-mathematical principle" of MacPherson

24

Is there a universal countable group? (a countable group containing every countable group as a subgroup)