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earned this badge 82 times.
Is every closed embedded codimension-n submanifold cut out by a section of a rank-n vector bundle?
Awarded 13 hours ago
Is the Hessian of Hamilton's function positive-definite?
Awarded Dec 14, 2023 at 21:17
Do Lie algebroids pull back (along submersions)?
Awarded Oct 13, 2023 at 22:21
Why not _co_free modules?
Awarded Aug 31, 2023 at 14:49
Is the category of affine schemes (over a fixed field) Cartesian closed?
Awarded Jun 17, 2023 at 15:20
How should I think about correspondences?
Awarded May 21, 2023 at 9:03
Is there a version of Temperley-Lieb using sl(3) rather than sl(2)?
Awarded Sep 4, 2022 at 13:33
Abelianization of Lie groups
Awarded Jul 23, 2022 at 14:47
What is the product in the 2-category of spans?
Awarded Jul 6, 2022 at 11:34
How can I tell whether a Poisson structure is symplectic "algebraically"?
Awarded Jul 2, 2022 at 0:20
When is the adjoint to a monoidal functor monoidal?
Awarded May 24, 2022 at 8:51
Is there a canonical Hopf structure on the center of a universal enveloping algebra?
Awarded Oct 29, 2021 at 20:08
Is there a way to see a topological group as the "Cayley graph" of its "infinitesimal generators"?
Awarded Oct 16, 2021 at 11:00
Is every graded manifold affine, and is this definition of graded manifold the right one?
Awarded Aug 17, 2021 at 13:09
What is the Zariski closure of the space of semisimple Lie algebras?
Awarded Apr 24, 2021 at 21:39
What extra conditions are necessary for the following version of Koszul duality?
Awarded Apr 20, 2021 at 8:59
Which functions are Wiener-integrable?
Awarded Oct 10, 2020 at 1:26
What are examples of cogenerators in R-mod?
Awarded Oct 7, 2020 at 20:50
What should I call a "differential" which cubes, rather than squares, to zero?
Awarded Mar 25, 2020 at 18:40
Does the Tannaka-Krein theorem come from an equivalence of 2-categories?
Awarded Oct 4, 2019 at 18:30
Functoriality of the cotangent bundle
Awarded Aug 7, 2019 at 17:45
Is a bialgebra pairing of Hopf algebras automatically a Hopf pairing?
Awarded Jun 7, 2019 at 19:35
Is there an algebraic "derived mapping space" construction that encompasses both Hochschild homology and loop spaces of non-simply-connected spaces?
Awarded Apr 4, 2019 at 22:20
What is the (Koszul? derived?) interpretation of a pair of Lie algebras with the same cohomology?
Awarded Nov 25, 2018 at 22:45
Normal coordinates for a manifold with volume form
Awarded Nov 24, 2018 at 20:10
How difficult is Morse theory on stacks?
Awarded Nov 22, 2018 at 2:35
If "tensor" has an adjoint, is it automatically an "internal Hom"?
Awarded Nov 15, 2018 at 16:55
Which monoidal categories are equivalent to their centers?
Awarded Aug 26, 2018 at 21:40
What are the points of Spec(Vassiliev Invariants)?
Awarded Aug 23, 2018 at 14:20
Do I need to know what an infinity-Gerstenhaber algebra is, and if so, what is it?
Awarded Aug 13, 2018 at 12:40
What's the correct notion of determinant of a bilinear pairing?
Awarded Jul 30, 2018 at 5:55
Does projective imply flat?
Awarded Mar 18, 2018 at 19:53
What's the "correct" smooth structure on the category of manifolds?
Awarded Jul 5, 2017 at 5:28
What's an example of a locally presentable category "in nature" that's not $\aleph_0$-locally presentable?
Awarded Jun 10, 2017 at 15:00
In the dictionary between Poisson and Quantum, what corresponds to Coisotropic?
Awarded Mar 8, 2017 at 12:57
What is a good basic reference on model categories?
Awarded Dec 9, 2016 at 8:20
Does a connected manifold with vanishing Euler characteristic admit a nowhere-vanishing vector field?
Awarded Oct 24, 2016 at 10:01
How many flat connections has a line bundle in algebraic geometry?
Awarded Aug 25, 2016 at 15:52
What abstract nonsense is necessary to say the word "submersion"?
Awarded Aug 20, 2016 at 17:51
What characterizes rational functions with nonnegative integer Taylor coefficients?
Awarded Jun 17, 2016 at 21:00
How is tropicalization like taking the classical limit?
Awarded May 24, 2016 at 23:09
How can I understand the "groupoid" quotient of a group action as some sort of "product"?
Awarded Apr 12, 2016 at 8:08
What's the status of the following relationship between Ramanujan's $\tau$ function and the simple Lie algebras?
Awarded Mar 7, 2016 at 21:49
What is the precise relationship between groupoid language and noncommutative algebra language?
Awarded Mar 2, 2016 at 11:27
How cavalier can I be when demanding a category have direct sums?
Awarded Jan 22, 2016 at 18:05
What functor is adjoint to the tensor product of 2-vector spaces?
Awarded Dec 14, 2015 at 12:24
Is there a good (co)homology theory for manifolds with corners?
Awarded Sep 15, 2015 at 3:29
What does the Tannakian formalism reconstruct when fed the category of chain complexes?
Awarded Jul 4, 2015 at 13:44
Can surfaces be interestingly knotted in five-dimensional space?
Awarded Apr 24, 2015 at 7:20
Is there a topological description of combinatorial Euler characteristic?
Awarded Feb 3, 2015 at 17:48
What is the infinite-dimensional-manifold structure on the space of smooth paths mod thin homotopy?
Awarded Jan 6, 2015 at 12:30
Splitting a space into positive and negative parts
Awarded Aug 2, 2014 at 13:45
What is an algebraic group over a noncommutative ring?
Awarded May 3, 2014 at 16:55
Is there a "categorical" description of Grothendieck's algebra of differential operators?
Awarded Mar 5, 2014 at 23:22
Where can I easily look up / calculate (abelian) group cohomology?
Awarded Mar 4, 2014 at 17:10
Can epi/mono for natural transformations be checked pointwise?
Awarded Jan 10, 2014 at 10:58
Which is the correct universal enveloping algebra in positive characteristic?
Awarded Sep 25, 2013 at 0:27
Is every G-invariant function on a Lie algebra a trace?
Awarded Sep 12, 2013 at 18:30
Is there an accepted definition of $(\infty,\infty)$ category?
Awarded Jun 25, 2013 at 6:39
Critical points on a fiber bundle
Awarded Jun 15, 2013 at 23:05
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