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Best online mathematics videos?
63
What properties make $[0,1]$ a good candidate for defining fundamental groups?
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when is A isomorphic to A^3? (2)
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When are two proofs of the same theorem really different proofs
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Cures for mathematician’s block (as in writer’s block)
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Taking lecture notes in lectures
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Theorems for nothing (and the proofs for free)
33
What is a metric space?
31
How do I check if a functor has a (left/right) adjoint?
31
What is the name for the following categorical property?
26
Google question: In a country in which people only want boys
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Combinatorial results without known combinatorial proofs
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Continuous function from $[0,1]$ to $[0,1]$
23
What’s a magical theorem in logic?
20
Citation of a paper with a proof you would like to improve
20
What are the benefits of viewing a sheaf from the “espace étalé” persepctive?
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motivation of filtered colimits (2)
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Can epi/mono for natural transformations be checked pointwise?
17
“Philosophical” meaning of the Yoneda Lemma
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What’s a groupoid? What’s a good example of a groupoid?
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Coend computation
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Extending arithmetic functions to groups (2)
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“Functors between monads”: what are these really called?
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Is a functor which has a left adjoint which is also its right adjoint an equivalence ?
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Terminology in category theory
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How to distinguish between natural and unnatural equivalences of categories
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Recovering a monoidal category from its category of monoids
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Does the category Monoid of monoids have finite coproducts?
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Why should algebraic objects have naturally associated topological spaces? (Formerly: What is a topological space?)
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What properties “should” spectrum of noncommutative ring have?
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