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Answers
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5
What is the characteristic property of surjective submersions?
5
Is a rhombus rigid on a sphere or torus? And generalizations.
7
edges minus vertices
13
Which Riemannian manifolds admit a finite dimensional transitive Lie group action?
42
Demonstrating that rigour is important
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A question about a one-form on Riemannian manifold
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Is there a Whitney Embedding Theorem for non-smooth manifolds?
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Lie group actions and f-relatedness
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What are some correct results discovered with incorrect (or no) proofs?