Yemon Choi

6,657

Reputation

10240 views

Registered User

Name	Yemon Choi
Member for	2 years
Seen	2 hours ago
Website	ifwisdomwereteachable.wordpress.com
Location	Saskatoon
Age

Assistant Professor at the University of Saskatchewan. Firm believer that "they also serve who only stand and wait".

Mainly working these days on abstract harmonic analysis, but always liable to fall off the wagon and into the cohomology of Banach algebras. Other interests currently include: homological perspectives on functional analysis; probabilistic methods; convolution operators arising from group actions.

stats recent reputation favorites

29

Questions

votes newest views recent

8

24

votes

1

answer

1k

views

Is the set of primes “translation-finite”?

nt.number-theory co.combinatorics analytic-number-theory fourier-analysis open-problem

nov 19 09 at 6:22 Yemon Choi 6,657●1●13●36

9

15

votes

2

answers

440

views

Does left-invertible imply invertible in full group C*-algebras (discrete case)?

c-star-algebras oa.operator-algebras

oct 28 at 7:31 Andreas Thom 11.2k●1●20●54

4

14

votes

2

answers

580

views

Groups of order $n$ with a character whose degree is at least $0.8\sqrt{n}$ (say)

gr.group-theory characters finite-groups

jun 23 at 23:15 Geoff Robinson 4,647●10●14

3

13

votes

2

answers

541

views

“Explicit” embedding of $\ell^1$ as a closed subalgebra of a direct sum of matrix algebras

oa.operator-algebras matrices fa.functional-analysis

dec 18 10 at 10:31 Mikael de la Salle 2,443●4●13

5

11

votes

2

answers

651

views

Approximating operators on Banach spaces by bounded operators on a proper dense subspace

banach-spaces

jul 11 10 at 11:35 Bill Johnson 12.3k●1●27●58

3

11

votes

1

answer

323

views

A left inverse for the comultiplication on a Hopf von Neumann algebra

oa.operator-algebras quantum-group von-neumann-algebras

nov 30 at 9:41 Matthew Daws 4,879●1●6●20

1

11

votes

1

answer

229

views

Is the space of Hankel operators complemented in B(H)?

fa.functional-analysis operator-theory reference-request banach-spaces

nov 16 at 20:50 Yemon Choi 6,657●1●13●36

9

votes

4

answers

565

views

Can we bound degrees of complex irreps in terms of the average conjugacy class size?

gr.group-theory finite-groups rt.representation-theory

apr 30 11 at 7:27 Geoff Robinson 4,647●10●14

1

8

votes

0

answers

158

views

Can we find arbitrarily many elements of SU(2) generating a good copy of MAX($\ell_1^n$) inside VN(SU(2))?

oa.operator-algebras banach-spaces rt.representation-theory

apr 14 at 21:01 Yemon Choi 6,657●1●13●36

2

7

votes

2

answers

586

views

Closed, complemented subspaces of $l^1(X)$ when $X$ is uncountable

banach-spaces fa.functional-analysis

dec 13 09 at 21:37 Bill Johnson 12.3k●1●27●58

139

Answers

votes newest views recent

Which journals publish expository work?

What is the main goal of a paper, really?

Describe a topic in one sentence.

Geometric Interpretation of Trace

Eigenvalues of Matrix Sums

Is there a compact group of countably infinite cardinality?

Books you would like to read (if somebody would just write them…)

Does there exist a continuous function of compact support with Fourier transform outside L^1?

How to select a journal?

Is Thompson’s group F residually finite?

Why do so many textbooks have so much technical detail and so little enlightenment?

Epimorphisms have dense range in TopHausGrp?

Probabilistic Proofs of Analytic Facts

Do torsion-free groups give projectionless group ($C^\ast$) algebras?

Interesting applications of the Pigeon-hole Principle

Looking for an introductory textbook on algebraic geometry for an undergraduate lecture course

How exactly is Hochschild homology a monad homology? (2)

What are fixed points of the Fourier Transform

Mittag-Leffler condition: what’s the origin of its name?

Banach spaces with few linear operators ?

Is Fourier analysis a special case of representation theory or an analogue?

Finding questions between functional analysis and set theory

Characterizing specific “concrete” mathematical objects by abstract general properties (2)

is a non-invertible operator a boundary point of the group of invertible operators?

Riemann zeta at even integers

Projections which are not completely bounded

opposite Banach space

Can one do without Riesz Representation?

What should be offered in undergraduate mathematics that’s currently not (or isn’t usually)?

Theories of Noncommutative Geometry

3690

Votes

2988

702

112

Tags

fa.functional-analysis× 44
oa.operator-algebras× 24
reference-request× 16
banach-spaces× 15
gr.group-theory× 14
ct.category-theory× 14
soft-question× 13
fourier-analysis× 11
pr.probability× 10
c-star-algebras× 10

von-neumann-algebras× 9
matrices× 9
ca.analysis-and-odes× 8
big-list× 8
linear-algebra× 7
banach-algebras× 7
rt.representation-theory× 6
hilbert-space× 6
finite-groups× 6
semigroups× 5

gn.general-topology× 5
real-analysis× 4
nt.number-theory× 4
noncommutative-geometry× 4
measure-theory× 4
homological-algebra× 4
examples× 4
co.combinatorics× 4
ag.algebraic-geometry× 4
ac.commutative-algebra× 4

open-problem× 3
noncommutative-algebra× 3
monoids× 3
mathematics-education× 3
geometry× 3
dg.differential-geometry× 3
cv.complex-variables× 3
books× 3
topological-groups× 2
terminology× 2

teaching× 2
st.statistics× 2
short-exact-sequences× 2
set-theory× 2
quantum-mechanics× 2
publishing× 2
operator-theory× 2
operator-spaces× 2
model-theory× 2
journals× 2

50

Badges