User André Caldas

24 votes

1 answer

5k views

Direct approach to the Closed Graph Theorem

asked Apr 27, 2012 at 14:41

23 votes

1 answer

6k views

What are examples of bounded bijections $T:E\to F$, with $F$ Banach, that are not open?

asked Jan 31, 2013 at 21:12

10 votes

1 answer

645 views

Krein-Smulian counterexample for the weak (not *) topology.

asked May 7, 2017 at 0:39

9 votes

1 answer

667 views

Topology for convergent sequences

asked May 19, 2013 at 0:41

8 votes

1 answer

2k views

Isomorphic measure-preserving systems: circle and torus

asked Oct 18, 2011 at 23:06

5 votes

2 answers

595 views

Doubts on the mathematical content of the Hitler Downfall Meme.

asked Dec 31, 2019 at 12:02

3 votes

1 answer

569 views

Stone-Čech compactification is extremally disconnected.

asked Mar 13, 2019 at 17:57

3 votes

1 answer

263 views

Measure weak convergence and the one-point compactification

asked Jul 10, 2014 at 1:32

2 votes

1 answer

117 views

Why is this weaker then Uniform Integrability?

asked Jun 27, 2017 at 2:05

2 votes

0 answers

122 views

Criteria for a.s. convergence of series of independent positive random variables.

asked Jul 1, 2017 at 6:29

2 votes

0 answers

61 views

Avoiding a fixed point theorem.

asked Aug 24, 2020 at 11:18

1 vote

0 answers

53 views

Invariant k-form and inner derivation: relation used in symplectic geometry.

asked Sep 14, 2021 at 1:18

1 vote

1 answer

352 views

Subnet of a sequence.

asked Oct 23, 2017 at 16:14

1 vote

0 answers

365 views

Double annihilator for subspaces of $E^*$: counter example.

asked May 1, 2017 at 5:45

0 votes

1 answer

37 views

Passing from $\mathbb{F}_p$ to $\mathbb{Z}$.

asked Apr 10, 2019 at 14:05

Stack Exchange Network

15 Questions

Direct approach to the Closed Graph Theorem

What are examples of bounded bijections $T:E\to F$, with $F$ Banach, that are not open?

Krein-Smulian counterexample for the weak (not *) topology.

Topology for convergent sequences

Isomorphic measure-preserving systems: circle and torus

Doubts on the mathematical content of the Hitler Downfall Meme.

Stone-Čech compactification is extremally disconnected.

Measure weak convergence and the one-point compactification

Why is this weaker then Uniform Integrability?

Criteria for a.s. convergence of series of independent positive random variables.

Avoiding a fixed point theorem.

Invariant k-form and inner derivation: relation used in symplectic geometry.

Subnet of a sequence.

Double annihilator for subspaces of $E^*$: counter example.

Passing from $\mathbb{F}_p$ to $\mathbb{Z}$.