Martijn Caspers

Upcoming/Recent events

2023-...

• November 30-December 5, 2025. Operator Algebraic Quantum Groups: Structure, Dynamics, and Geometry. Banff (organizer with Michael Brannan, Benjamin Anderson-Sackaney, Lyudmyla Turowska, Mateusz Wasilweski).
  
  
• February 22, 2024. Seminar on Hecke algebras. Amsterdam.
  
  
• December 18-21, 2023. Conference Noncommutative analysis on groups and quantum groups. Besancon.
  
  
• August 21-25, 2023. Conference Noncommutative harmonic analysis and rigidity of operator algebras. Delft (organizer). More info here.
  
  
• June 12-16, 2023. Workshop on Noncommutative harmonic analysis and quantum information. Mittag-Leffler institute in Sweden (organizer with Adam Skalski, Lyudmyla Turowska). More info here.
  
  
• April 19, 2023. Functional Analysis Seminar. Harbin (online).
  
  

2022

• November 28, 2022. Free probability seminar at virtual Berkely.
  Title: On the isomorphism class of q-Gaussian W*-algebras
  
  
• November 25, 2022. Seminar at virtual Wuhan.
  Title: Multi-linear transference theorems.
  
  
• May 30-June 3, 2022. Workshop NSeaG at the Lorentz Center in Leiden.
  
  
• May 18, 2022. Functional analysis seminar virtual UCLA Los Angeles.
  Title: On the Akemann-Ostrand property for q-Gaussian von Neumann algebras
  
  
• May 2-6, 2022. Workshop Oslo (organizer with Nadia Larsen and Sven Raum).
  
  
• March 28-April 1, 2022. Seminar and research visit at IST Vienna.
  Title: Quantum Markov Semi-groups: Rigidity and Approximation Properties
  
  
• March 23, 2022. Operator algebra seminar at Virtual Seoul.
  Title: Local and multilinear noncommutative de Leeuw theorems.
  
  

2021

• December 13, 2021. Delft-Besancon day at Delft.
  Title: Riesz transforms on Coxeter groups and strong solidity.
  
  
• November 15-19, 2021. Workshop Quantum Probability and Non-commutative Harmonic Analysis at the Lorentz Center Leiden (organizer with Eric Ricard and Adam Skalski).
  
  
• October 27, 2021. Seminar at IMPAN, Warsaw.
  Title: Riesz transforms on Coxeter groups and strong solidity.
  
  
• August 20, 2021. Online IWOTA session on Operator Algebras.
  Title: Riesz transforms in deformation-rigidity theory.
  
  
• August 18, 2021. Online IWOTA session on operator spaces, quantized function theory and noncommutative Lp-spaces.
  Title: Weak (1,1) type estimates for multi-linear operator integrals
  
  
• March 29-21, 2021. Workshop C*-algebras and geometry of groups and semigroups Virtual Oslo (organizer with Nadia Larsen and Sven Raum).
  See here (participation upon invitation).
  
  
• Feburary 1, 2021. Online Oselot seminar.
  Title: Perturbations of commutators and non-commutative Lipschitz functions.
  
  
• Feburary 1, 2021. Seminar at Virtual Berkeley.
  Title: Riesz transforms on compact quantum groups and strong solidity.
  
  
• January 27, 2021. Seminar at Virtual Saarbrucken.
  Title: Riesz transforms on compact quantum groups and strong solidity.
  
  
• January 26, 2021. Seminar at workshop on Non-Commutative Geometry along the North Sea at the Virtual North Sea.
  Title: TBA.
  
  
• January 14, 2021. Seminar Virtual Glasgow.
  Title: Riesz transforms on compact quantum groups and strong solidity.
  
  

2020

• December 7, 2020. Quantum group seminar at Virtual Europe, see here.
  Title: Riesz transforms on compact quantum groups and strong solidity.
  
  
• September, 2021. Seminar at Virtual Besancon.
  Title: Weak type estimates for multiple operator integrals and the absolute value functions.
  
  
• August 2020. Virtual Noncommutative Analysis Weekly Seminar Virtual Texas, see here.
  Title: Khintchine inequalities for graph products and Hecke C*-algebras.
  
  
• June 3, 2020. Staff colloquium at VU Virtual Amsterdam.
  Title: Commutator estimates and non-commutative Lipschitz functions.
  
  
  Only virtual events for a while.
• January 2020. Lunch colloquium. Delft.
  Title: Non-commutative Lipschitz functions.
  
  

2019

• November-December 2019. Visiting UNSW Sydney.
  
  
• November 2019. Zemanek prize ceremony. Warsaw.
  Title: Non-commutative Lipschitz functions.
  
  
• October 2019. Mini-workshop on operator algebraic quantum groups. Oberwolfach (organizer).
  
  
• May 2019. Workshop mathematics of quantum information theory. Leiden (organizer).
  
  
• April 2019. IMPAN Warsaw.
  
  
• March 2019. Analysis seminar. Texas A & M at College Station .
  Title: BMO-estimates for commutators and non-commutative Lipschitz functions.
  
  
• March 2019. Brazos seminar. Houston.
  Title: Gradient forms and strong solidity of free quantum groups.
  
  
• January 2019. Workshop on quantum groups. Tehran.
  Title: Applications of quantum Markov-semi-groups to von Neumann algebras and commutator estimates.
  
  

2018

• October 2018. Oslo.
  Title: Quantum Markov semi-groups, gradients and strong solidity.
  
  
• September 2018. Workshop Non-commutative Analysis and Positivity. Delft.
  Title: Quantum Markov semi-groups, gradient forms and BMO-spaces.
  
  
• August 2018. Seminar at UNSW Sydney.
  Title: Gradient forms and strong solidity of free quantum groups
  
  
• July 2018. Workshop on Cuntz-Pimsner cross pollination. Leiden (Lorentz Center).
  Title: Gradient forms and strong solidity of free quantum groups
  
  
• May 2018. Interactions between Operator Space Theory and Quantum Probability with Applications to
  Quantum Information. Oberwolfach.
  Title: Gradient forms and strong solidity of free quantum groups
  
  
• March 2018. Seminar at QuTech, Delft.
  Title: Gradient forms and strong solidity of free quantum groups
  
  

2017

• November 2, 2017. Delft.
  Title: Non-commutative Markov semi-groups: harmonic analysis and approximation.
  
  
• October 20, 2017. Seminar. Leuven.
  Title: BMO-spaces and Free Araki-Woods factors.
  
  
• June 19, 2017. Colloquium.Delft.
  Title: Non-commutative harmonic analysis and perturbations of commutators.
  
  
• May 29 - June 2, 2017. Order Structure, Jordan Algebras and Geometry. Leiden (Lorentz Center).
  
  
• May 18- May 22, 2017. Chinese harmonic analysis annual meeting.Wuhan.
  Title: Weight lifting with ultrapowers.
  
  
• May 15- May 19, 2017. Conference Topological quantum groups and harmonic analysis.Seoul.
  Title: Weight lifting with ultrapowers.
  
  
• February 20- March 31, 2017. Research visit. Sydney.
  Title: Absence of Cartan subalgebras for Hecke von Neumann algebras.
  
  
• May 6- 10, 2017. Conference Non-commutativve analysis.Chennai.
  Title: Weight lifting with ultrapowers.
  
  
• January-February 2017. Research visit. IMPAN Warsaw (with Adam Skalski).
  Title: Perturbations of commutators and a problem of Nazarov and Peller.
  
  

2016

• December 5 - December 9, 2016. Waterloo.
  Title: Absence of Cartan subalgebras for Hecke von Neumann algebras.
  
  
• November 28 - December 2, 2016. UIUC Urbana-Champaign.
  Title: Absence of Cartan subalgebras for Hecke von Neumann algebras.
  
  
• August 15-26, 2016. Lectures at summer school "Geometry" (aimed at bachelor students who are finishing their second or third year). Utrecht. link.
  Title: The geometry of discrete groups.
  
  
• July 11-15, 2016. 7ECM satellite conference: Compact Quantum Groups. Greifswald. link.
  Title: Absence of Cartan subalgebras for Hecke von Neumann algebras.
  
  
• May 9-13, 2016. Conference: Quantum groups: geometry, representations, and beyond. Oslo.
  Title: Absence of Cartan subalgebras for Hecke von Neumann algebras.
  
  
• March 1-10, 2016. Research visit at IPM. Tehran.
  Lectures covering approximation properties of operator algebras, graph products and their deformations.
  
  
• February 7-13, 2016. Mini-Workshop: Operator Spaces and Noncommutative Geometry in Interaction. Oberwolfach.
  Title: Hecke von Neumann algebras, operator spaces and absence of Cartan subalgebras
  
  
• January 25-29, 2016. Winter school on "Banach Methods in Noncommutative Geometry: Isomorphism conjectures and geometry of groups". Link. Münster. (organizer).
  
  
• January 11-15, 2016. Research visit + NCG seminar at IMPAN. Warsaw.
  Title: Absence of Cartan subalgebras for Hecke von Neumann algebras

2015

• October 29-30, 2015. GQT Colloquium. link. Woudschoten.
  Title: Approximation properties of quantum groups and their operator algebras
  
  
• October 19-20, 2015. ANR meeting. Espaces d'opérateurs, espaces Lp non-commutatifs, probabilités non-commutatives et applications à la théorie quantique de l'information. Paris.
  Title: Weak type commutator and Lipschitz estimates
  
  
• September, 2015. Nijmegen.
  Title: Noncommutative De Leeuw theorems
  
  
• August 17-21, 2015. YMCA (Young Mathematicians in C*-Algebras). link. Copenhagen.
  Title: Noncommutative De Leeuw theorems
  
  
• July 13-17, 2015. Workshop on C*-algebras: Geometry and Actions. link. Münster.
  Title: Non-commutative commutator and Lipschitz estimates
  
  
• July, 2015. School on Topological Quantum Groups. link. Bedlewo.
  Lecture series: Locally compact quantum groups.
  
  
• June 14th-June 20th, 2015. Oberwolfach meeting on Noncommutative Geometry.
  Title: Noncommutative De Leeuw theorems
  
  
• April 16th, 2015. Staffcolloquium. Leiden.
  Title: Noncommutative De Leeuw theorems
  
  
• March 9th-13th, 2015. Conference on Algebraic and Analytic Aspects of Quantum Lévy Processes. Greifswald.
  Title: The Haagerup property for arbitrary von Neumann algebras and quantum Dirichlet forms
  
  

2014

• December 15th-19th, 2014. Conference on Operator Spaces and Quantum Probability. Besancon.
  Title: Graph products of operator algebras
  
  
• December 11, 2014. Glasgow.
  Title: Noncommutative De Leeuw theorems
  
  
• December 2nd, 2014. GAGA seminar. Utrecht.
  Title: The Haagerup property for arbitrary von Neumann algebras
  
  
• November 19, 2014. Seminar. Oslo.
  Title: The Haagerup property for arbitrary von Neumann algebras
  
  
• Sept 27/28, 2014. Wabash mini-conference Indianapolis.
  Title: Noncommutative De Leeuw theorems
  
  
• Sept 25, 2014. Analysis seminar UIUC Illinois.
  Title: The Haagerup property for arbitrary von Neumann algebras
  
  
• Juli 28th-Aug 1st, 2014. Research visit at Paris 7. With Pierre Fima.
  
  
• June, 2014. Conference on Banach methods in Noncommutative Geometry, see here. Wuhan.
  Title: The Haagerup property for arbitrary von Neumann algebras
  
  
• May, 2014. Workshop Quantum Groups and Operator Spaces. Fields Institute. Toronto. See here.
  Title: The Haagerup property for arbitrary von Neumann algebras
  
  
• May 7-9, 2014. Workshop Quantum Groups and Operator Algebras (organizer). Münster.
  
  
• March 21st, 2014. Operator Algebra seminar. Leuven.
  Title: On approximation properties of (quantum) groups and von Neumann algebras.
  
  
• March 6th, 2014. Seminar, University of Warsaw.
  Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces.
  
  
• March 3rd, 2014. Non-commutative geometry seminar and research visit (with A. Skalski). IMPAN Warsaw.
  Title: Approximation properties of groups, quantum groups and von Neumann algebras: an overview.
  
  
• February 17-28, 2014. Research visit + seminar, ICMAT (with J. Parcet). Madrid.
  Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces.
  
  
• January 21st, 2014. Oberseminar Münster.
  Title: The Haagerup property for arbitrary von Neumann algebras.
  
  

2013

• Conference. Analysis, geometry and representation theory. Nagoya.
  Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces.
  
  
• Conference. Operator spaces, harmonic analysis and quantum probability. ICMAT Madrid.
  Title: The best constants for operator Lipschitz functions on Schatten classes.
  
  
• Workshop. Approximation properties for quantum groups and harmonic analysis on quantum groups. Cergy-Pontoise/Paris.
  Title: Homological properties of quantum groups.
  
  
• Oberseminar. Westfälische Wilhelms-Universität, Münster.
  Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces.
  
  
• Seminar. Université Lille 1, Laboratoire P. Painlevé.
  Title: Quantum groups and noncommutative Lp-spaces.
  
  
• Seminar. Université Paris 6, Institut de Mathématiques de Jussieu.
  Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces.
  
  
• Seminar. Université Reims, Champagne Ardennes.
  Title: Quantum groups, Fourier theory and non-commutative Lp-spaces.
  
  
• Seminar. Université Basse Normandie, Caen.
  Title: Schur and Fourier multipliers of an amenable group acting on non-commutative Lp-spaces.
  
  
• Non-commutative geometry seminar. IMPAN, Warsaw.
  Title: Quantum groups, Fourier theory and non-commutative Lp-spaces.
  
  

2012

• Workshop. Arbre de Noël: non-commutative geometry. Metz.
  Title: Quantum groups and non-commutative Lp-spaces.
  
  
• Workshop. Operator algebras. Seoul.
  Title: The Lp-Fourier transform on locally compact quantum groups.
  
  
• Journées du GDR. Analyse fonctionnelle, harmonique et probabilités. Paris.
  Title: The best constants for operator Lipschitz functions on Schatten classes.
  
  
• Workshop. Operator spaces and quantum information theory. Lyon.
  Title: The best constants for operator Lipschitz functions on Schatten classes.
  
  
• Conference. Quantum groups and non-commutative geometry. Oslo.
  Title: Quantum groups, Gelfand pairs and non-commutative Lp-spaces.
  
  
• Congress. Dutch mathematical congress. Eindhoven.
  Title: Fourier analysis on quantum groups.
  
  
• Workshop. Quantum groups. Nijmegen.
  Title: Locally compact quantum Gelfand pairs.
  
  
• Seminar. Université Blaise Pascal, Clermont-Ferrand.
  Title: Quantum groups, Fourier theory and non-commutative Lp-spaces.
  
  
• Seminar. Saarlandes Universität, Saarbrücken.
  Title: Quantum groups, Fourier theory and non-commutative Lp-spaces.
  
  
• Seminar. Chungbuk National University, Cheongju.
  Title: Gelfand pairs of quantum groups.
  
  
• Seminar on Mathematical Physics. Radboud Universiteit Nijmegen.
  Title: The best constants for operator Lipschitz functions on Schatten classes.
  
  
• Operator algebra seminar. University of Copenhagen.
  Title: The Lp-Fourier transform on locally compact quantum groups.
  
  
• Oberseminar. Georg-August Universität, Göttingen.
  Title: Gelfand pairs of quantum groups.
  
  

2011

• Seminar. Monash University, Melbourne.
  Title: The Lp-Fourier transform on locally compact quantum groups.
  
  
• Seminar. Monash University, Melbourne.
  Title: Gelfand pairs of quantum groups.
  
  
• Seminar. University of New South Wales, Sydney.
  Title: The Lp-Fourier transform on locally compact quantum groups.
  
  
• Seminar. Technische Universiteit Delft.
  Title: The Lp-Fourier transform on locally compact quantum groups.
  
  

2010

• Conference. Quantum groups, free probability and non-commutative geometry. Lumini/Marseille.
  Title: The Lp-Fourier transform on locally compact quantum groups.
  
  
• Conference. Quantum groups. Clermont-Ferrand.
  Title: Modular properties of matrix coefficients of corepresentations of a locally compact quantum group.
  
  
• Operator algebra seminar. Katholieke Universiteit, Leuven.
  Title: Modular properties of matrix coefficients of corepresentations of a locally compact quantum group.
  
  
• PhD Colloquium. Radboud Universiteit Nijmegen.
  Title: Modular properties of matrix coefficients of corepresentations of a locally compact quantum group.