User Idonknow

11 votes

1 answer

704 views

Examples of Baire Class $\xi+1$ but not $\xi$ functions for each countable ordinal $\xi.$

asked May 31, 2018 at 8:31

8 votes

2 answers

602 views

If $E\oplus_\phi E \cong E\oplus_\psi E,$ does it imply that $\phi= \psi$?

asked Jul 31, 2018 at 4:49

7 votes

0 answers

328 views

Status of two Banach space theory open problems posted by Pełczyński

asked Apr 24, 2018 at 13:48

7 votes

1 answer

436 views

Reference Request: Existence of Ordinal Rank Theory?

asked May 26, 2018 at 13:19

7 votes

2 answers

823 views

How do I efficiently find a sequence of Reidemeister moves between equivalent link diagrams?

asked Nov 6, 2013 at 14:57

4 votes

2 answers

1k views

If the closed unit ball of Banach space has at least one extreme point, must the Banach space the be a dual space?

asked Dec 2, 2018 at 7:06

3 votes

1 answer

162 views

Is it true that every Banach space has at least one extreme point that is normed by some point?

asked Oct 24, 2018 at 8:56

3 votes

1 answer

285 views

Example of a Baire Class $1$ function $f$ satisfying $\omega\cdot n<\beta(f)\leq \omega\cdot (n+1)$ for some natural number $n\geq 1.$

asked Jun 1, 2018 at 11:38

3 votes

1 answer

221 views

Does Bishop-Phelps Theorem hold for extreme points (slightly different version)?

asked Jun 12, 2018 at 10:33

2 votes

0 answers

312 views

Do there exist similar programs which connect different field of Mathematics like Langlands program? [closed]

asked May 24, 2018 at 14:04

2 votes

0 answers

519 views

When will the upper regularization of a bounded function not defined?

asked Apr 9, 2017 at 10:54

2 votes

0 answers

192 views

Generalize upper semicontinuous regularization using Borel Hierachy

asked Apr 14, 2017 at 0:32

2 votes

0 answers

65 views

Splitting of ordinals of oscillation ranks of a Baire $1$ function

asked Aug 14, 2017 at 5:22

2 votes

2 answers

446 views

Usage of complex moments in complex plane

asked May 13, 2013 at 13:10

2 votes

0 answers

93 views

Open problems concerning Araujo's biseparating maps

asked Feb 18, 2018 at 1:24

1 vote

0 answers

105 views

Generalize characterization of upper semicontinous functions

asked Apr 15, 2017 at 0:37

1 vote

1 answer

245 views

Definition of $F_{\sigma}$ sets in terms of $\varepsilon$?

asked Apr 15, 2017 at 13:14

1 vote

1 answer

162 views

Does there exist a class of real-valued upper semicontinuos functions on $X$ such that $\mathcal{F}$ is countable?

asked Apr 13, 2017 at 3:40

1 vote

2 answers

223 views

Is $C_b(Q,E)$ linearly isometrically isomorphic to $C(\beta Q,E)$ where $\beta Q$ is the Stone–Čech compactification of $Q$?

asked May 8, 2018 at 13:07

1 vote

0 answers

217 views

Status of an open problem in isometric aspect of Banach space theory

asked May 18, 2018 at 13:42

1 vote

1 answer

176 views

Reference on vector-valued convex conjugate

asked Nov 21, 2018 at 13:03

0 votes

0 answers

115 views

If two spheres are isometric, does there exist a bijective isometry $T:S\to S$ with $\|Tu-\alpha Tv\|_Y \leq \|u-\alpha v\|_X$ for all $\alpha>0?$

asked Jan 6, 2019 at 16:09

0 votes

1 answer

116 views

Does there exists an extreme point $(a_1^,...,a_n^)$ of $B_{\mu^}$ such that $a_i^\neq 0$ for all $1\leq i\leq n$ and $\sum_{I=1}^n a_i^*a_i=1?$

asked Jul 22, 2018 at 0:34

0 votes

0 answers

65 views

Does $\{ x^* \circ \psi_t:x^\in ext(E^), t\in K \}\subset ext(X^*)$ hold?

asked Jan 10, 2018 at 1:48

Stack Exchange Network

24 Questions

Examples of Baire Class $\xi+1$ but not $\xi$ functions for each countable ordinal $\xi.$

If $E\oplus_\phi E \cong E\oplus_\psi E,$ does it imply that $\phi= \psi$?

Status of two Banach space theory open problems posted by Pełczyński

Reference Request: Existence of Ordinal Rank Theory?

How do I efficiently find a sequence of Reidemeister moves between equivalent link diagrams?

If the closed unit ball of Banach space has at least one extreme point, must the Banach space the be a dual space?

Is it true that every Banach space has at least one extreme point that is normed by some point?

Example of a Baire Class $1$ function $f$ satisfying $\omega\cdot n<\beta(f)\leq \omega\cdot (n+1)$ for some natural number $n\geq 1.$

Does Bishop-Phelps Theorem hold for extreme points (slightly different version)?

Do there exist similar programs which connect different field of Mathematics like Langlands program? [closed]

When will the upper regularization of a bounded function not defined?

Generalize upper semicontinuous regularization using Borel Hierachy

Splitting of ordinals of oscillation ranks of a Baire $1$ function

Usage of complex moments in complex plane

Open problems concerning Araujo's biseparating maps

Generalize characterization of upper semicontinous functions

Definition of $F_{\sigma}$ sets in terms of $\varepsilon$?

Does there exist a class of real-valued upper semicontinuos functions on $X$ such that $\mathcal{F}$ is countable?

Is $C_b(Q,E)$ linearly isometrically isomorphic to $C(\beta Q,E)$ where $\beta Q$ is the Stone–Čech compactification of $Q$?

Status of an open problem in isometric aspect of Banach space theory

Reference on vector-valued convex conjugate

If two spheres are isometric, does there exist a bijective isometry $T:S\to S$ with $\|Tu-\alpha Tv\|_Y \leq \|u-\alpha v\|_X$ for all $\alpha>0?$

Does there exists an extreme point $(a_1^,...,a_n^)$ of $B_{\mu^}$ such that $a_i^\neq 0$ for all $1\leq i\leq n$ and $\sum_{I=1}^n a_i^*a_i=1?$

Does $\{ x^* \circ \psi_t:x^\in ext(E^), t\in K \}\subset ext(X^*)$ hold?