Top network posts

• 40 Does $\mathbb C\mathbb P^\infty$ have a group structure?
• 33 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?
• 23 Why are Tamagawa numbers equal to Pic/Sha?
• 23 A "meta-mathematical principle" of MacPherson
• 22 Does smooth and proper over $\mathbb Z$ imply rational?
• 22 Is there a universal countable group? (a countable group containing every countable group as a subgroup)
• View more network posts →