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«Yemon Choi Curriculum Vitae Work Address: Home Address: Department of Mathematics and Statistics Lancaster University 34 Waterside, Bailrigg, ...»

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Yemon Choi

Curriculum Vitae

Work Address: Home Address:

Department of Mathematics and Statistics

Lancaster University 34 Waterside,

Bailrigg, Lancaster Lancaster

Lancashire LA1 4YF LANCS LA1 1AY Tel (work): 01524 593 960 Email: y.choi1@lancaster.ac.uk Webpage: http://www.maths.lancs.ac.uk/∼choiy1/pubmath/math index.html Personal details Born 8th March 1979, London, England (British citizenship). Gender: male.

Current and recent employment January 2014 – Lecturer. Department of Mathematics and Statistics, Lancaster University.

July 2010 – January 2014 Assistant Professor (tenure-track). Department of Mathematics and Statistics, University of Saskatchewan, Saskatoon. (Probation renewed successfully March 2013.) August 2008 – June 2010 Postdoctoral Researcher. D´ partement de math´ matiques et de statistique, Universit´ Laval, Qu´ bec City.

e e e e February 2007 – July 2008 Postdoctoral Researcher. Department of Mathematics, University of Manitoba, Winnipeg.

Education 2002–2006: University of Newcastle upon Tyne PhD in Pure Mathematics (conferred June 2006).

Thesis written on Cohomology of commutative Banach algebras and ℓ1 -semigroup algebras, supervised by M. C. White.

2000–2001: Sidney Sussex College, Cambridge University Part III of Mathematical Tripos (see this link for further information).

1997–2000: Sidney Sussex College, Cambridge University B.A. (Cantab) in Mathematics.

Languages English (native fluency), French (reading and conversation, intermediate). Some spoken Cantonese.

Computer skills L TEX, HTML (proficient); TEX, XML (basic).

A Yemon Choi Selected publications Y. Choi, M. Ghandehari, Weak amenability for Fourier algebras of 1-connected nilpotent Lie groups.

J. Funct. Anal. 268 (2015) no. 8, 2440–2463. [cf. 1405.6403 ] Y. Choi, M. Ghandehari, Weak and cyclic amenability for Fourier algebras of connected Lie groups.

J. Funct. Anal. 266 (2014) no. 11, 6501–6530. [cf. 1304.3710 ] Y. Choi, I. Farah, N. Ozawa, A nonseparable amenable operator algebra which is not isomorphic to a C∗ -algebra.

Forum of Math, Sigma. 2 (2014), e2 (12 pages). [cf. 1309.2145 ] Y. Choi, On commutative, operator amenable subalgebras of finite von Neumann algebras.

J. reine angew. Math. 678 (2013), 201–222.

–  –  –

My full publication list is given at the end of this CV. Preprint copies of all articles can be found on the arXiv.

Research interests Convolution and Fourier algebras of locally compact groups, and relationships with operator algebras.

Perturbation, lifting and similarity problems for normed representations.

Spectra of convolution operators arising from group representations on Banach spaces.

Category-theoretic techniques in functional analysis.

Semigroup algebras, in particular their (co)homological properties.

Research grants 2011–2014: NSERC Discovery Grant 402153-2011.

“Cohomological invariants and perturbation problems for Fourier algebras and group algebras”.

18,000 CAD per year; originally awarded for 5 years, terminated 2013/14 due to change of job.

2010–2013: New Faculty Start-up Fund, awarded by University of Saskatchewan. 20,000 CAD.

Research visits Queen’s University Belfast (August 2014, 1 week);

Fields Institute, Toronto (May 2014, 2 weeks);

Fields Institute, Toronto (March/April 2014, 3 weeks);

Newcastle University (March 2014, 1 week);

Newcastle University (May 2013, 1 week);

University of Leeds (May 2012, 1 week);

Newcastle University (July 2011, 2 weeks);

University of Leeds (May/June 2010, 4 weeks);

Newcastle University (January 2010, 1 week);

University of Manitoba (April 2009, 1 week);

Newcastle University (October 2008, 1 week);

University of Waterloo (October 2007, 1 week).

Yemon Choi Student supervision PhD supervision 2015/10 – present (co-supervised with N. J. Laustsen) B. Horvath. Topic: Approximately multiplicative maps between Banach algebras (provisional title).

2014/10 – present (co-supervised with N. J. Laustsen) C. Menez. Topic: Extensions of Banach and operator algebras (provisional title).

2010/09 – 2013/11 (co-supervised with E. Samei) M. Alaghmandan. Topic: Weighted hypergroup algebras and problems in

Abstract

harmonic analysis.

Master’s thesis supervision 2011/09 – 2013/12 (co-supervised with E. Samei) L. Moradi. Topic: Compact and weakly compact derivations on ℓ1 (Z+ ) and L1 (R+ ).

Summer research projects 2012/06 – 2012/09 A. Rochon. “Orthogonal circulant matrices, optimization, and Hadamard-like behaviour”.

2009/05 – 2009/08 J.-S. Lechasseur. “Translation-finite sets of positive integers”.

2nd-year undergraduate research project. (Student funded by ISM grant) Undergraduate reading projects 2014/10 – 2015/04 J. Clarkson, “Space groups and group cohomology”.

Final-year reading project/dissertation as part of MMath degree.

R. Harrington, “Compressed sensing”.

Final-year reading project/dissertation as part of MMath degree.

2010/01 – 2010/04 (co-supervised with F. Gourdeau) C. Arsenault, “Transformations de la sph`re: isom´tries, cartographie et pavages”.





e e Final-year undergraduate reading project/dissertation.

Yemon Choi Professional service Refereeing and reviewing Reviewer for Math Reviews.

Journal referee for: Bull. London Math. Soc.; Canad. Math. Bull.; Glasgow Math. Journal; Houston J. Math.; J. Austral.

Math. Soc.; J. Math. Anal. Appl.; Q. J. Math. (Oxford); Semigroup Forum; Studia Math.

Thesis examinations/committees

–  –  –

Other committee/administrative work (Sept. 2014 – present) Postgraduate Tutor (Mathematics), Department of Mathematics and Statistics, Lancaster University (June 2014 – present) Lancaster representative of the North British Functional Analysis Seminar.

Member (2012– Dec. 2013) of the Graduate Committee of the Department of Mathematics and Statistics, University of Saskatchewan.

Member (2011 – Sept. 2013) of the Outreach Committee of the Department of Mathematics and Statistics, University of Saskatchewan.

Administrator (Oct. 2006–Jan. 2007) for the Maths-Aid centre in the University of Newcastle upon Tyne.

Conference organization

Joint organizer with E. Samei of the splinter session “Harmonic Analysis and Operator Spaces” in the Canadian Mathematical Society meeting, Regina, Summer 2012.

Joint organiser & website author for the one-day meeting Postgraduate Pure Mathematics in the North East, held at the University of Newcastle upon Tyne on 28th June 2004. [http://www.mas.ncl.ac.uk/∼nyc9/PoPMiNE/main.html] Yemon Choi Courses taught Courses marked with (∗) are those where I was course co-ordinator/director, in addition to delivery of lectures.

–  –  –

Talks and presentations Slides for some of the talks are available via my webpage. List does not include internal seminar activity.

Invited lecture series or mini-courses Topics in the (non-)amenability of Banach algebras Invited series of lectures for PhD students (9 times 75 minutes) Institute of Mathematics at the Polish Academy of Sciences, Warsaw, 13th–17th April 2015..

Conference and workshop talks Invited talks are indicated by (♦).

January 2014 – present:

(♦) AP, CAP, ITAP and another AP (plenary lecture) Groups and Operators, Chalmers University, August 2016.

(♦) Derivations on Fourier algebras of connected groups (plenary lecture) Young Functional Analysts’ Workshop, Queen’s University Belfast, April 2016.

(♦) Derivations on semigroup algebras and Fourier algebras (plenary lecture) Banach Algebras and Applications 2015, Fields Institute, Toronto, August 2015.

(♦) Unitarizable group representations and amenable operator algebras QOP Network Meeting, Lancaster University, September 2014.

Completely bounded versions of Helson sets Operator Methods in Harmonic Analysis, Queen’s University Belfast, August 2014.

(♦) Orthogonality relations, and the study of derivations on Fourier algebras Abstract Harmonic Analysis Days, IMAC, Castellon, July 2014.

(♦) Unitarizable group representations and amenable operator algebras Operator Spaces, Locally Compact Quantum Groups and Amenability, Fields Institute, Toronto, May 2014.

(♦) Weak amenability of Fourier algebras: old and new results Banach and Operator Algebras over Groups, Fields Institute, Toronto, April 2014.

September 2010 – December 2013

The ZL-amenability constant of a finite group Splinter session, CMS Winter Meeting, December 2013.

(♦) Derivations from the disc algebra into natural modules Banach Algebras and Their Applications, Chalmers University, August 2013.

(♦) Direct finiteness of CVp (G) and PFp (G) International Conference on Abstract Harmonic Analysis, Granada, May 2013.

Derivations on Fourier algebras of some connected Lie groups Canadian Symposium on Abstract Harmonic Analysis, Thunder Bay, May 2013.

(♦) Can quotients of the Fourier algebra be operator algebras?

Harmonic analyis, operator algebras, and representations, CIRM (Luminy), October 2012.

(♦) Quotients of Fourier algebras, and representations that are not completely bounded Northwest Functional Analysis Seminar, BIRS, March/April 2012.

Approximately multiplicative functionals on weighted semilattice algebras Saskatchewan Analysis Day, University of Saskatchewan, March 2012.

(♦) Commutative amenable operator algebras Banach Algebras 2011, Waterloo, August 2011.

Yemon Choi Commutative amenable subalgebras of finite von Neumann algebras Canadian Symposium on Operator Theory, University of Victoria, May 2011.

Commutative amenable operator algebras Operator Theory and its Applications, Chalmers University, April 2011.

February 2007 – August 2010 Directly finite group algebras: some examples and questions Canadian Abstract Harmonic Analysis Symposium, Saskatoon, August 2010.

Convolution operators with empty residual spectrum Splinter session, FAV10, Valencia, June 2010.

(♦) “Left invertible implies invertible”: examples and questions in abstract harmonic analysis Banach algebra and operator space techniques in topological group theory, Leeds, May 2010.

Convolution operators, residual spectrum, and directly finite Banach algebras Young Functional Analysts’ Workshop, Newcastle, January 2010.

Convolution operators with empty residual spectrum Splinter session, CMS Winter Meeting, Windsor, December 2009.

(♦) Cohomology of strong semilattices of Banach algebras 19th international Banach Algebras conference, Bedlewo, Poland, July 2009.

Translation finite subsets and weakly compact derivations Canadian Abstract Harmonic Analysis Symposium, University of Alberta, May 2009.

When are injective convolution operators surjective?

Canadian Symposium on Abstract Harmonic Analysis, Carleton University, May 2008.

(♦) The Fourier algebra of the free group is not operator approximately amenable Meeting on Banach algebras and harmonic analysis, University of Leeds, April 2008.

Homology and cohomology of ℓ1 (Zk ) + Banach Algebras 2007, Universit´ Laval, July 2007.

e Biflatness for Clifford semigroup algebras Splinter session, CMS-MITACS Summer Meeting, Winnipeg, June 2007.

Weakened notions of amenability for semilattice algebras Functional analysis splinter session, British Mathematics Colloquium, Swansea, April 2007.

up to January 2007

Cohomology problems for the analytic Wiener algebra Belfast Functional Analysis Day, Queen’s University Belfast, November 2006.

ℓ1 -convolution algebras, and bounded cohomology, of semilattices Semigroups splinter session, British Mathematics Colloquium, Newcastle, April 2006.

Cohomology of ℓ1 -semilattice algebras Banach Algebras and Applications, Bordeaux, July 2005.

Normalisation of cochains, and applications to Clifford semigroup algebras Banach Algebras and Cohomology meeting, Leeds, May 2005.

Cohomology of semigroup algebras Analysis splinter session, British Mathematics Colloquium, Liverpool, April 2005.

Simplicial cohomology of Aα Analysis splinter session, British Mathematics Colloquium, Belfast, April 2004.

Yemon Choi Invited seminar talks (external) 2006 – present AP, WAP, CAP, ITAP Analysis Seminar, University of Glasgow, Glasgow, May 2016.

Orthogonality relations, and the study of derivations on Fourier algebras Analysis & PDE seminar, University of Sussex, January 2016.

Translation-finite sets of positive integers Dynamical Systems and Analysis Seminar, University of Manchester, December 2015.

Constructing amenable operator algebras Functional Analysis Seminar, University of Oxford, October 2015.

Derivations on Fourier algebras of connected Lie groups Analysis Seminar, University of Glasgow, Glasgow, May 2014.

Derivations on Fourier algebras of some connected Lie groups Algebra and Analysis Seminar, University of Nottingham, Nottingham, March 2014.

The ZL-amenability constant of a finite group Analysis Seminar, Newcastle University, Newcastle-upon-Tyne, March 2014.

Commutative amenable subalgebras of B(H): a partial survey Geometry and Analysis Seminar, Queen Mary, University of London, London, May 2013.

Weak amenability of Fourier algebras of connected Lie groups Functional Analysis Seminar, Newcastle University, Newcastle-upon-Tyne, May 2013.

Commutative amenable operator algebras Functional Analysis Seminar, Newcastle University, Newcastle-upon-Tyne, May 2012.

Group representations where every convolution operator has empty residual spectrum Seminar on Functional Analysis and Applications, Instituto Superior T´ cnico, Lisbon, May 2010.

e TF subsets of Z+ and weakly compact derivations Analysis seminar at University of Waterloo, Ontario, March 2010.

Group representations and associated algebras: from convolution operators to cohomology Mathematics & Statistics colloquium, University of Saskatchewan, February 2010.

Homological aspects of Clifford semigroup algebras YFAG seminar (2 talks), University of Leeds, September 2008.



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