Bruno Stonek

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Math student in Universidad de la República, Montevideo, Uruguay.


37 Answers

newest activity votes
13
How many connected components does $\mathrm{GL}_n(\mathbb R)$ have?
11
What is the set of all functions from $\{0, 1\}$ to $\mathbb{N}$ equinumerous to?
7
Why is associativity required for groups?
7
Problem in understanding set theory
7
Reference for Algebraic Geometry
7
If $\sum a_n b_n <\infty$ for all $(b_n)\in \ell^2$ then $(a_n) \in \ell^2$
6
Can the indexing set of a cartesian product have the cardinality of the continuum?
6
What does “extend linearly” mean in linear algebra?
5
$\mathrm{Spec}(R)\!=\!\mathrm{Max}(R)\!\cup\!\{0\}$ $\Rightarrow$ $R$ is a PID
5
Splicing together Short Exact Sequences
5
Ideal as a projective module
5
Is there a less ad hoc way to find the degree of this extension?
5
Every $R$-module is free $\implies$ $R$ is a division ring
5
What exactly is a neighborhood of the diagonal on a topological space?
4
Composition and one factor are monomorphisms, is the other factor mono?
4
Which one result in maths has surprised you the most?
3
Explanation of term “closed under” in the definition of a sigma algebra?
3
linear maps $\mathbb{R} \to \mathbb{R}$ are bijective or zero
3
Are free modules injective?
3
Particular case of Nakayama's lemma
3
What's bad about left $\mathbb{H}$-modules?
2
Any compact embedded $2$-dimensional hypersurface in $\mathbb R^3$ has a point of positive Gaussian curvature
2
Abstract nonsense proof of the cocompleteness of the category of groups
2
Graph $y=1/\sin x$
2
Codomains, products and limits
2
Fixed, attracting points are Fatou points
1
There is an orthogonal projection of a subspace onto a canonical subspace that is an isomorphism
1
Is vector subtraction commutative?
1
Best Sets of Lecture Notes and Articles
1
Dual notion of free module
1 2