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Carla_
  • Member for 1 year, 3 months
  • Last seen more than a month ago
12 votes
2 answers
1k views

(Why) Does Algebraic Topology only deal with topological spaces up to homotopy?

6 votes
0 answers
131 views

Are there "differentiable manifolds" that don't admit a $C^1$-structure

5 votes
1 answer
126 views

Is there a classification of symmetric monoidal closed structures on $\mathbf{Ab}$?

4 votes
1 answer
65 views

Does $\omega$-consistency depend on the encoding?

4 votes
0 answers
66 views

Full subcategories of $\textbf{Grp}$ that are monoidal closed

4 votes
2 answers
100 views

Showing if the group $\frac {F[a,b]}{(a^2 = b^2)}$ is torsion free

3 votes
1 answer
86 views

Whats the relation between preorders and (small) thin categories?

2 votes
1 answer
103 views

MIT old Calculus Exam Question about estimating $\sin(\pi+\frac 1 {100})$ to two decimal places

2 votes
0 answers
33 views

Why are PROPS and their morphisms strict?

2 votes
0 answers
81 views

Is the duality in linear programming related to category theory?

1 vote
1 answer
150 views

Why are natural transformations the morphisms between functors?

1 vote
1 answer
174 views

Can $\operatorname{Spec}(R)$ be not homeomorphic to $\operatorname{Spec}(S)$ but be isomorphic as a poset?

1 vote
0 answers
59 views

(Why) do most irreducible quartic polynomials with four real roots over $\mathbb Q$ have galois group $A_4$?

0 votes
1 answer
225 views

What is the importance of the spectral theorem? (not the importance of diagonalization)

0 votes
2 answers
160 views

Conceptually, what do abelian groups represent? [closed]