Skip to main content
Pedro Lauridsen Ribeiro's user avatar
Pedro Lauridsen Ribeiro's user avatar
Pedro Lauridsen Ribeiro's user avatar
Pedro Lauridsen Ribeiro
  • Member for 11 years, 6 months
  • Last seen this week
19 votes
Accepted

Intuition behind Sobolev Inequality

12 votes

Gathering books on Lorentzian Geometry

11 votes
Accepted

Show that $\Omega^*(M)\otimes \Omega^*(N)$ is isomorphic to $\Omega^*(M\times N)$

7 votes
Accepted

In what conditions a weak solution is a classical solution?

7 votes
Accepted

Easier proof of Tietze theorem in metric case.

4 votes
Accepted

Example of a compact topological space $M$ such that $\mathcal M_1(M)$ is not compact.

4 votes
Accepted

A detail in the proof of Schur's lemma: the closures of the $\ker$ and $\operatorname{img}$ of the intertwiner.

2 votes
Accepted

$(1-z^n)^{-1} = \dfrac{1}{n}\sum_{k=0}^{n-1}(1-\epsilon(n)^kz)^{-1},~\epsilon(n) = \exp(-2\pi i/n)$

2 votes
Accepted

$\mathcal D$ is the space of compactly supported smooth functions on $\mathbb R^n$. Show $\mathcal D'$ is complete with respect to weak$^*$-topology.

2 votes
Accepted

If $\alpha''$ and $\alpha'$ are collinear, then $\alpha$ is a pre-geodesic.

1 vote

Formula for $(A + vv^\top)^{-1}$ in terms of $A^{-1}$ and $v$.

1 vote

Sequences of bounded smooth functions versus numerical sequences of their supremum norms

1 vote

About timelike surfaces with non-diagonalizable shape operator.

1 vote
Accepted

Reference for theorem about completion of locally convex topological algebras

0 votes

Can we embed $X'\otimes Y$ into the space of bounded, linear operators $X\to Y$?