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Daniel Teixeira
  • Member for 4 years, 9 months
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6 votes
2 answers
136 views

Give a reason why $\mathbb Z_{64}\times \mathbb Z_4$ and $\mathbb Z_{64}\times \mathbb Z_{2}\times \mathbb Z_{2}$ are not isomorphic.

5 votes
2 answers
357 views

Completeness of the category of enriched categories

5 votes
0 answers
144 views

Why do we care about $(\infty,2)$-categories?

4 votes
2 answers
101 views

Show that $\mathbb{Z}_5[x]/(x^2+x+1)\cong\mathbb{Z}_5[x]/(x^2+x+2)$

3 votes
1 answer
257 views

In $\mathbb{Z}[\sqrt{d}]$, $d$ is not divisible by the square of any prime. Why?

3 votes
1 answer
121 views

Explicit homeomorphism $SL(2,\mathbb{C})\cong SU(2)\times\mathbb{R}^3$.

3 votes
0 answers
90 views

Linear algebra constructions on vector bundles

3 votes
0 answers
64 views

Why $T_pM$ instead of $TM_p$?

3 votes
0 answers
63 views

Why are acyclic fibrations called so?

3 votes
1 answer
53 views

For $n\geq 3$, does every horn $\Lambda^n_k\to N\mathcal C$ have a filler?

2 votes
0 answers
78 views

Localization of a ring at any subset

2 votes
0 answers
48 views

Show that $\text{Top}$ is locally Kan.

2 votes
0 answers
45 views

Cycles in an acyclic complex of projectives are projectives.

2 votes
1 answer
125 views

Monoidal categories as categories internal to $\textbf{Cat}$

2 votes
1 answer
152 views

Are simplicial sets equal if their non-degenerate simplices are the same?

2 votes
1 answer
245 views

Show that $\int |f_n-f|\to 0$

2 votes
1 answer
295 views

Is there an $\infty$-category of spaces?

2 votes
1 answer
71 views

Canonical model structure on a 2-category

2 votes
1 answer
38 views

$V^{1,0}$ as a Lagrangian subspace of $V^c$

2 votes
1 answer
82 views

Inductive definition of $\infty$-category

2 votes
1 answer
150 views

A ring is commutative if the solution of $ab=ca$ is always unique [duplicate]

2 votes
3 answers
431 views

Flat principal bundles over a simply connected manifold are trivial

2 votes
0 answers
55 views

Surfaces of revolution as vector bundles

2 votes
0 answers
127 views

Invariance of signature in semi-riemannian manifolds

1 vote
1 answer
35 views

The projection from the time-orientable double cover preserves topological properties.

1 vote
0 answers
195 views

Using the Fourier transform to solve PDEs with non-integrable initial conditions

1 vote
1 answer
37 views

Can a data set of a function $f:\mathbb{R}^n\to\mathbb{R}^k$ decide if it is differentiable?

1 vote
2 answers
41 views

Let $C\subset E$ be a convex subspace and $a\in E\setminus C$. The point in $C$ closest to $a$ is unique.

1 vote
0 answers
41 views

Vacuum solutions of Einstein's field equations with $O(n)$ isometry group

1 vote
0 answers
57 views

Definition of tensor product of graded maps