165

Answers
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8
Uncountable preimage of every point
9
Is an “infinite compositions of arrows” meaningful?
23
Example of a good Zero Knowledge Proof.
26
why haven’t certain well-researched classes of mathematical object been framed by category theory?
5
When does adding inverses of morphisms preserve commutativity of a diagram?
4
What functor is adjoint to the tensor product of 2-vector spaces?
3
Does every cocontinuous functor between categories of presheaves on small categories have a right adjoint?
8
Are rings really more fundamental objects than semi-rings?
3
Coend computation continued
8
What is the minimum N for which there exist N points in the plane that cannot be covered by any number of non-overlapping closed unit discs?
7
What is a reference for an explicit, logic-based, statement of duality in category theory (in ‘'complicated’' situations)? And what are the prerequisites for a beginner in logic?
7
Ackermann-related function
21
What is the definition of “canonical” ?
14
Colimits in the category of smooth manifolds
5
Equivalences in Model Categories
6
Homotopy type of set of self homotopy-equivalences of a surface
10
K-theory as a generalized cohomology theory
3
Signed minimum?
10
Are there any important mathematical concepts without discrete analog?
7
The urge to combine 1- and 2-morphisms in slicing a 2-category.
4
Pullbacks for primitive recursive functions.
8
Spectra and localizations of the category of topological spaces
9
$(\infty,1)$-categories and model categories
11
Truncated product of RiemannZeta(1)?
14
Mathematical solution for a two-player single-suit trick taking game?
11
How cavalier can I be when demanding a category have direct sums?
13
Is the semigroup M(n, Z) finitely presented? If so, where can I find a presentation of it?
3
Homological Algebra for Commutative Monoids?
4
nontrivial isomorphisms of categories
2
Equimorphisms of categories
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