Talks

2001

• NATO Workshop "Modality, Probability, and Bell's theorem".
  08/19-23/2001, Cracow, Poland.
  title: "Localization properties of KMS-states in 2-dim. chiral conformal QFT".
  
  2002
  
• NUMBER THEORY/ ALGEBRAIC GEOMETRY STUDENTS SEMINAR AT B.U.
  09/24/2002, Boston University, Department of Mathematics and Statistics.
  title: "Rota-Baxter Algebras".
  
  2003
  
• Rutgers University at Newark, Mathematics and Computer Science, Algebra and Number Theory seminar.
  03/12/2003, title: "The Rota-Baxter Equation and Quasi-Shuffles".
  
• V. International Workshop, "LIE THEORY AND ITS APPLICATIONS IN PHYSICS".
  06/16-22/2003, Varna, Bulgaria.
  title: "Insertion and Elimination: the Lie algebra of Feynman graphs".
  
• Boston University Mathematical Physics Seminar.
  11/04/2003, Center for Mathematical Physics, Boston University.
  title: "From Baxter to Baxter".
• Rutgers University at Newark, Mathematics and Computer Science, Algebra and Number Theory seminar.
  11/07/2003, title: "Aspects of the Connes-Kreimer Hopf Algebra".
  
• Institut de Recherche Mathématique Avancée de Strasbourg, Séminaire "Algèbre et Topologie".
  12/16/2003, title: "The Rota-Baxter map and unitary infinitesimal bialgebras".
  
  2004
  
• Groupe de travail, F. Hélein - J. Kouneiher - V. Roubtsov,
  Système intégrable, géométrie différentielle et théorie quantique des champs",
  Université Paris 7, UFR de Mathématiques, Equipe Géométrie et Dynamique.
  03/02/2004, title: "Classical R-Matrices, Rota-Baxter Operators and the Connes-Kreimer Hopf algebra".
  
• Seminar on Mathematical Physics at the Université de Bourgogne, (SEMINAIRE de MATHS-PHYSIQUE).
  03/18/2004, title: "On the Lie Algebra of Renormalization Theory".
  
• Séminaires de Physique Théorique, at I.H.É.S..
  03/31/2004, title: "On some aspects of the Rota-Baxter Relation".
  
• Rutgers University at Newark, Mathematics and Computer Science, Algebra and Physics Seminar.
  11/08/2004, title: "The Rota-Baxter Relation and the Connes-Kreimer approach to Renormalization in pQFT".
  
• Workshop on Combinatorial Hopf Algebras. BIRS, Banff,
  08/30/2004, title: "Rota-Baxter Algebras and Hopf Algebras".
  
• Institut GIRARD DESARGUES, Université Lyon 1, Séminaire de Physique Mathématique.
  10/08/2004, title: "The Rota-Baxter Relation in Mathematics and Theoretical Physics".
  
• Dipartimento di Fisica, Università degli Studi di Roma "Tor Vergata", Seminars in ``Tor Vergata''.
  10/11/2004, title: "Bogoliubov's R-Operation and The Lie Algebra of Renormalization".
  
• Laboratoire de Mathématiques, l' Université Blaise Pascal de Clermont-Ferrand, Séminaire de Mathématiques Pures.
  10/19/2004, title: "On the algebraic Birkhoff decomposition in perturbative Quantum Field Theory".
  
• Institut de Recherche Mathématique Avancée de Strasbourg, Séminaire "Algèbre et Topologie".
  10/26/2004, title: "Unital infinitesimal bialgebras, Lie bialgebras, and Rota-Baxter operators".
  
• Universität Göttingen, FAKULTÄT FÜR PHYSIK, Institut für Theoretische Physik, ''Seminar Quantenfeldtheorie".
  11/25/2004, title: "Rota-Baxter Algebras and Bogoliubov's R-Operation".
  
• Université de Nice - Sophia Antipolis, Laboratoire J.-A. Dieudonné, Séminaire d'Algèbre & Topologie, France.
  12/13/2004, title: "Rota-Baxter Type Operators, Generalized Shuffle Products, and Dendriform Algebras".
  
• Bonn University, Physics Institute, theoretical physics seminar, Germany.
  12/14/2004, title: "Algebraic structure of renormalization theory of perturbative QFT".
  
  2005
  
• Universidad Complutense de Madrid, Departamentos de Física Teórica I, SEMINARIOS, Spain.
  02/03/2005, title: "Bogoliubov's R-Operation in renormalization and Rota-Baxter Algebras".
  
• Universidad de Zaragoza, Departamento de Física Teórica, Theory Seminar, Spain.
  02/09/2005, title: "Rota-Baxter and associative Nijenhuis Algebras: An introduction".
  
• Universidad de Zaragoza, Departamento de Física Teórica, Theory Seminar, Spain.
  02/14/2005, title: "The Rota-Baxter Relation, Connes-Kreimer Hopf Algebra, and the classical Yang-Baxter equation".
  
• Laboratoire de Physique Théorique et Hautes Energies (L. P. T. H. E.), Universités Pierre et Marie Curie (P6) et Denis Diderot (P7), Theory Seminar, France.
  03/24/2005, title: "On the Birkhoff Decomposition in pQFT: the Baker-Campbell-Hausdorff recursion".
  
• CIRM Workshop, Opérades 2005, J.-L. Loday, Alessandra Frabetti, CIRM, Luminy, FRANCE.
  04/04/2005, title: "Quantum Field Theory, Rota-Baxter Algebra, and Rooted Trees".
  
• University of Pennsylvania Department of Mathematics, Deformation Theory Seminar, U.S.A.
  04/13/2005, title: "On the structure of free non-commutative Rota-Baxter algebras".
  
• Rutgers University New Brunswick, Mathematics Department, Algebra Seminar, U.S.A.
  04/15/2005, title: "Infinitesimal bialgebras and associative classical Yang-Baxter equations".
  
• Kolchin Seminar in Differential Algebra, Hunter College of CUNY, New York City, U.S.A.
  04/16/2005, title: "Algebraic Birkhoff decomposition in pQFT, and the diagrammatic Renormalization Group differential equation".
  
• Rutgers University at Newark, Mathematics and Computer Science, Mathematics Colloquium, U.S.A.
  04/20/2005, title: "Algebraic Relations for q-Analogs of Multiple Zeta Values".
  
• Texas A&M University, Mathematics Department, Algebra and Combinatorics Seminar, U.S.A.
  04/22/2005, title: "Quantum Field Theory and Rooted tree Hopf Algebras: an introduction to the recent work of Connes-Kreimer".
  
• Universidad Autonoma de Madrid, Theoretical Physics Department, Theory Seminar, Spain.
  05/26/2005, title: "Aspects of Rota-Baxter operators: a Factorization theorem and Rooted Trees".
  
• Max Planck Institute for Mathematics in the Sciences, Leipzig, Germany.
  Mini-Workshop on renormalization and number theory,
  06/20/2005 title: "Rota-Baxter Algebras: Factorizing Feynman Rules".
  
• Max Planck Institute for Mathematics, Bonn, Gauge Theory Seminar, Germany.
  07/15/2005, title: "Rota-Baxter Algebras and Renormalization".
  
• International Workshop on Noncommutative Geometry (NCG 2005)
  September 11-22, 2005, School of Mathematics, IPM Tehran, Iran
  4 Lectures: "Renormalization in Quantum Field Theory via Hopf Algebras (after Connes and Kreimer) (I-IV)".
  
• York University, Department of Mathematics and Statistics, APPLIED ALGEBRA SEMINAR, Toronto, Ontario, CANADA.
  10/17/2005, title: "Combinatorics of renormalization as matrix calculus, Rota--Baxter operators, and rooted tree shuffles".
  
  2006
  
• The Department of Physics at Queen Mary, University of London, String theory seminar, London, Great Britain.
  01/19/2006, title: "Matrix Representation of the Combinatorics of Renormalization in Perturbative QFT".
  
• CIRM Workshop, "Renormalization and Galois Theory", F. Fauvet, J.-P. Ramis, CIRM, Luminy, France.
  03/17/2006, title: "A Motif for Simple Algebra Decomposition or Under the Spell of the Rota-Baxter Relation".
  
• Institut de Mathématiques de Jussieu, Paris 6 et 7, Séminaire sur les Algèbres Enveloppantes, Paris, France.
  04/28/2006, title: "Birkhoff type decompositions: renormalization in perturbative QFT as a classical factorization problem".
  
• Department of Mathematics, Vanderbilt University, Nashville, Tennessee, U.S.A.
  The fourth annual spring institute on noncommutative geometry and operator algebras
  Noncommutative Geometry, Quantum Field Theory and Motives.
  05/14/2006, title:"Birkhoff type decompositions and the Baker-Campbell-Hausdorff recursion".
  
• University of Pennsylvania Department of Mathematics, Deformation Theory Seminar, U.S.A.
  05/18/2006, title: "On matrix differential equations in the Hopf algebra of renormalization".
  
• Feza Gursey Institute, Istanbul, Turkey.
  07/24/2006, title: "On Connes-Kreimer's Hopf algebra of renormalization".
  07/26/2006, title: "On matrix differential equations in the Hopf algebra of renormalization".
  
• Max Planck Institute for Mathematics in the Sciences, Leipzig, Germany.
  Conference "Hopf Algebras, Combinatorics, and Quantum Field Theory", 25-28.9.2006
  09/27/2006, title: "Locality, the beta function and the Dynkin idempotent".
  
• Université de Nice - Sophia Antipolis, Laboratoire J.-A. Dieudonné, France.
  Workshop: "Mathematical Methods for Ab Initio Quantum Chemistry".
  10/20/2006, title: "On Connes-Kreimer's beta function and renormalization group flow".
  
• Laboratoire de Mathématiques, l'Université Blaise Pascal de Clermont-Ferrand, Séminaire de Mathématiques Pures, France.
  10/24/2006, titre: "Sur la fonction beta de Connes-Kreimer".
  
• Université de Nantes, Département de Mathématiques, Laboratoire Jean Leray, Séminaire d'Algèbre et de Topologie, France.
  10/27/2006, titre: "Méthodes de Lie en renormalisation".
  
• Université Paris-Nord, Institut Galilée, Laboratoire d'Informatique, Séminaire Combinatoire, Informatique et Physique, France.
  10/31/2006, titre: "Relation de Rota-Baxter et décomposition de Birkhoff à la Connes-Kreimer des règles de Feynman".
  
• Université de Marne-la-Vallée, Institut d'électronique et d'informatique Gaspard-Monge, Laboratoire d'Informatique,
  Groupe de travail: Combinatoire algébrique et calcul symbolique, France.
  11/03/2006, titre: "Relation de Rota-Baxter et décomposition de Birkhoff à la Connes-Kreimer des règles de Feynman".
  
• Institut de Recherche Mathématique Avancée de Strasbourg, Séminaire "Algèbre et Topologie".
  11/14/2006, titre: "Méthodes de Lie en renormalisation".
  
• Universität Bonn, Mathematisches Institut, Oberseminar Globale Analysis, Germany.
  11/21/2006, title: "On Spitzer's identity".
  
• Université Paris-Nord, Institut Galilée, Laboratoire d'Informatique, Séminaire Combinatoire, Informatique et Physique, France.
  12/19/2006, title: "Rota-Baxter type relations and generalized shuffles and bialgebras".
  
  2007
  
• Laboratoire de Mathématiques, Informatique et Applications, Université de Haute Alsace, Mulhouse, France.
  01/11/2007, title: "Solving Bogoliubov's recursion for renormalization".
  
• Max Planck Institute for Mathematics, Bonn, Gauge Theory Seminar, Germany.
  02/07/2007, title: "Solving Bogoliubov's recursion for renormalization".
  
• The Erwin Schrödinger International Institute for Mathematical Physics, Vienna, Austria.
  "Mathematical and Physical Aspects of Perturbative Approaches to Quantum Field Theory", 26-30.03.2007
  Org.: R. Brunetti, K. Fredenhagen, D. Kreimer and J. Yngvason
  03/27/2007, title: "Solving Bogoliubov's recursion for renormalization".
  
• Universität Göttingen, Mathematisches Institut, Kolloquium der Mathematischen Gesellschaft.
  05/24/2007, title: "Solving Bogoliubov's recursion for renormalization".
  
• Universidad de Costa Rica, Escuela de Física and Centro de Investigaciones Matemáticas y Meta-Matemáticas.
  08/22/2007, title: "There is still life in linear matrix differential equations".
  
• Conference, 09/10-15/2007: Universite de Nice Sophia Antipolis, Laboratoire J.A. Dieudonné,
  Shuffles, Descents and Representations, Conference in Memory of Manfred Schocker.
  Org.: P. Diaconis, F. Patras, A. Ram, Ch. Reutenauer
  09/11/2007, title: "Rota-Baxter Type Algebras and Generalized Shuffle Products".
  
• Conference, COMBINATORIAL PHYSICS, November 21-24, 2007.
  Institute of Nuclear Physics PAN, Cracow, Poland
  Organizers: P. Blasiak, A. Horzela, G. H. E. Duchamp, K. A. Penson, A. I. Solomon.
  22/11/2007, title: "On the pre-Lie Magnus and Fer expansion".
  
• Institut de Recherche Mathématique Avancée de Strasbourg, Séminaire Algèbre et Topologie.
  12/04/2007, title: "The pre-Lie Magnus expansion on the Lie algebra of Feynman graphs".
  
• Laboratoire de Mathematiques, l'Universite Blaise Pascal de Clermont-Ferrand, France.
  Groupe de Travail Geometrie, Algebre, Algebre d'Operateur.
  12/07/2007, title: "The pre-Lie Magnus expansion on the Lie algebra of Feynman graphs".
  
  2008
  
• Mathematical Institute, University of Oxford, Stochastic Analysis Seminars, Great Britain.
  20/02/2008, title: "The pre-Lie Magnus and Fer expansion".
  
• Groupe de travail: Algebres de Hopf et calcul moulien
  L'Observatoire de Paris, mardi de 14h30 -- 16h30.
  26/02/2008, title: "Solving Bogoliubov's recursion in renormalization".
  
• University of Bergen, Department of Mathematics, Applied and Computational Mathematics, Norway.
  10/03/2008, title: "On matrix differential equations in the Hopf algebra of renormalization".
  
• Universidad de Zaragoza, Departamento de F?sica Te?rica, Theory Seminar, Spain.
  04/03/2008, title: "Rota-Baxter algebras, new combinatorial identities and applications".
  
• Isaac Newton Institute for Mathematical Sciences, Cambridge, UK.
  Workshop: Combinatorial Identities and their Applications in Statistical Mechanics, April 7-11, 2008.
  04/10/2008, title: "Solving Bogoliubov's recursion in renormalisation using a simple algebraic identity".
  
• Université Claude Bernard Lyon 1, Institut Camille Jordan, Lyon, France.
  Conférence Algèbre combinatoire et Arbres, May 26-30, 2008.
  05/29/2008, title: "The pre-Lie relation, rooted trees and the Magnus expansion".
  
• Feza Gursey Institute, Istanbul, Turkey.
  06/23/2008, 2hs, title: "The pre-Lie relation, rooted trees and the Magnus expansion".
  
• Hausdorff Center for Mathematics, Bonn University
  Conference: The manifold geometries of quantum field theory, June 30 - July 5, 2008
  07/02/2008, title: "Two rooted tree Hopf algebras and the pre-Lie Magnus expansion".
  
• Courant Research Center Göttingen Universität Göttingen, Mathematisches Institut.
  Workshop: Quantum fields and noncommutative geometry, July 11, 2008.
  07/11/2008, title: "Hopf Algebras in perturbative Quantum Field Theory".
  
• University of Bergen, Department of Mathematics, Bergen, Norway.
  09/09/2008, title: "Hopf Algebras and Lie Group Integrators".
  
• Universitat Jaume I, Departament de Matematiques, Castello de la Plana, Spain.
  09/24/2008, title: "The pre-Lie Magnus expansion and linear dendriform equations".
  
• Rencontre : Methodes numeriques et algebres de Hopf d'arbres, octobre 23 - 24, 2008
  Laboratoire de Mathematiques, Universit? Blaise Pascal, Clermont-Ferrand, France.
  10/24/2008, title: "The pre-Lie Magnus and Fer expansions and linear dendriform equations".
  
  2009
  
• Seminario Rubio de Francia, Area de Analisis Matematico, Departamento de Matematicas, Universidad de Zaragoza, Spain.
  2/12/2009, title: "On the Magnus expansion".
  
• Workshop: Manifolds and Geometric Integration Colloquia (MaGIC) 2009
  Hornsjo, Lillehammer, Norway, March 2 - 6, 2009.
  3/5/2009, title: "On the substitution law for B-series"
  
• Mathematisches Institut Uni Basel, Seminar fuer Analysis und Numerik.
  4/17/2009, title: "On the Magnus expansion".
• Scuola Internazionale Superiore di Studi Avanzati/International School for Advanced Studies (S.I.S.S.A.),
  Mathematical Physics sector, Non-commutative geometry seminar, Trieste, Italy.
  5/5/2009, title:"The combinatorics of Bogoliubov's recursion in perturbative renormalisation",
  7/5/2009, title:"The pre-Lie relation, rooted trees and the Magnus expansion".
• International Conference on Scientific Computation and Differential Equations SciCADE 2009
  May 24 - 29, Beijing, China.
  28/5/2009, title:"On the pre-Lie Magnus and Fer expansions".
• Groupe de travail : Theorie des champs periodes et polylogarithmes II, 2 -- 5 juin 2009,
  Institut des Hautes Etudes Scientifiques, Bures-sur-Yvette, France.
  05/06/2009, title: "From linear differential equations to Bogoliubov's recursion in perturbative renormalization".
• Universidad Nacional Autonoma de Mexico (UNAM), Instituto de Ciencias Nucleares, Mexico-City, Mexico.
  18/06/2009, title: "On the pre-Lie Magnus expansion".
• Universidad Nacional Autonoma de Mexico (UNAM), Instituto de Matematicas, Unidad Morelia, Mathematical Physics Seminar, Morelia, Mexico.
  19/06/2009, title: "On the pre-Lie Magnus expansion".
• Centro de Investigacion en Matematicas CIMAT, Guanajuato, Mexico.
  Summer School: Renormalization, graph polynomials, Hopf algebras and relations with motives (June 22 - July 1, 2009)
  4 lectures, title: "Combinatorial Hopf algebras".
  Centro de Investigacion en Matematicas CIMAT, Guanajuato, Mexico.
  International Workshop: Algebraic geometry and algebra related to renormalization (July 3 - 4, 2009)
  Talk, 03/07/2009, title: "Pre-Lie Butcher series".
• 2009 SIAM Annual Meeting and Conference on Control and Its Applications (CT09), July 6-8, 2009, Denver, Colorado, U.S.A.
  08/07/2009, title: "On the pre-Lie Magnus and Fer expansions".
  
• School-Conference on Hopf algebras Hopf-in-Lux at University of Luxembourg.
  Organizers: Said Benayadi, Philippe Bonneau, Yael Fegier, Martin Schlichenmaier
  3 Lectures: "Modern aspects of perturbative renormalization"
  Talk, 16/07/2009, title: "On the pre-Lie Magnus and Fer expansions".
  
• School of Mathematical and Computer Sciences, Dept. of Mathematics, Heriot-Watt University, Edinburgh, Scotland.
  Talk, 08/12/2009, title: "Multiplicative renormalization and its algebraic structure".