Talks
	Date	01.06.1973
	Title	Über ein System zweidimensionaler singulärer Integralgleichungen nicht-normalen Typs (On a system of 2-dimensional singular degenerated integral equations)
	Presentation	Talk
	Occasion	5. TMP (Tagung über Probleme und Methoden der Mathematischen Physik)
	Location	TH Karl-Marx-Stadt , Karl-Marx-Stadt, GDR
	Date	21.09.1975
	Title	Zwei Methoden zur näherungsweisen Lösung spezieller nichtlinearer partieller Differentialgleichungen (Two methods for an approximate solution of special non-linear partial differential equations)
	Presentation	Talk
	Occasion	International Summer School Theory of Nonlinear Operators
	Location	Akademie der Wissenschaften der DDR , Berlin, GDR
	Date	04.05.1978
	Title	Funktionentheorie im Rn (Holomorphic functions in Rn)
	Presentation	Institutional seminar
	Occasion	Invitation by W. Tutschke
	Location	Martin-Luther-University,   Halle, GDR
	Date	??.09.78
	Title	Methode der harmonischen Approximation (Method of harmonic approximation)
	Presentation	Talk
	Occasion	Annual Meeting of the HFR Numerische Mathematik of the  GDR
	Location	Castle of Reinhardtsbrunn, Friedrichroda, GDR
	Date	28.08.1979
	Title	On the solution of Maxwell equations in isotropic media
	Presentation	Talk
	Occasion	7.th International Summer School on Nonlinear Analysis, Theory and Applications
	Location	Akademie der Wissenschaften der DDR , Berlin, GDR
	Date	??.??.79
	Title	Mehrdimensionale Realisierung einer allgemeinen Operatorentheorie (A multidimensional realisation of a general operator theory)
	Presentation	Institutional seminar
	Occasion	Invitation by M. Tasche
	Location	Department of Mathematics, University of Rostock,  Rostock, GDR
	Date	21.01.1981
	Title	Multidimensional Cauchy-Riemann-Systems and Applications
	Presentation	Institutional seminar
	Occasion	Invitation by J. Brilla
	Location	Chair of Applied Mathematics, Comenius-University,  Bratislava, Czechoslovakia
	Date	25.03.1981
	Title	A multidimensional Realization of an Algebraic Operator Calculus and Applications for Solution of Elliptic Boundary Value Problems
	Presentation	Lecture
	Occasion	Semester on ''Mathematical Methods and Models in Contemporary Mechanics''
	Location	Banach-Center , Warsaw, Poland
	Date	20.10.1981
	Title	A Multidimensional Function Theory
	Presentation	Institutional Seminar
	Occasion	Invitation by A.W. Bitzadse
	Location	Steklov Institute of the Lomonossov University ,  Moscow , Soviet Union
	Date	31.03.1982
	Title	Die Berechnung thermischer Spannungen in der Aufheizphase (The calculation of thermal stresses in the heating-up period)
	Presentation	Talk
	Occasion	4. Wissenschaftliche Konferenz ''III. Kolloquium Eigenspannungen und Oberflächenverfestigung''
	Location	IHS Zwickau, Zwickau, GDR
	Date	1982
	Title	Mehrdimensionale Funktionentheorie
	Presentation	Institutional seminar
	Occasion	Invitation by R. Schimming
	Location	Universität Greifswald , Greifswald, GDR
	Date	03.06.1983
	Title	Die Arbeiten von Professor Jäckel bei der Anwendung mathematischer Methoden zur Optimierung volkswirtschaftlich bedeutsamer technologischer Prozesse (On the papers of Professor Jckel on the application of mathematical methods for the optimisation of economic relevant technological processes)
	Presentation	Talk
	Occasion	60. Birthday of Prof.Dr. Hans Jäckel
	Location	Technische Hochschule Karl-Marx-Stadt,  Karl-Marx-Stadt, GDR
	Date	07.01.1984
	Title	A hypercomplex Method for Calculating Stresses in 3-dimensional Bodies
	Presentation	Lecture
	Occasion	12. Internationale Winter School on Abstract Analysis
	Location	Academy of Science of Czechoslovakia , Churanov (Bohemian Forest), Czechoslovakia
	Date	25.09.1984
	Title	Application of quaternionic analysis for calculating Stresses in real bodies
	Presentation	Lecture
	Occasion	Semester on ''Partial Differential Equations'' (organised by B. Bojarski)
	Location	Stefan Banach-Center,  Warsaw, Poland
	Date	05.10.1984
	Title	Untere Abschätzungen des ersten Eigenwerts fr eine Klasse elliptischer Differentialoperatoren (Lower estimates of the first eigenvalue for a class of elliptic differential operators)
	Presentation	Talk
	Occasion	Tagung ber Partielle Differentialgleichungen und Steuertheorie (Conference on partial differential equations and operation research)
	Location	TH Leuna-Merseburg,  Merseburg, GDR
	Date	??.12.84
	Title	Analytischen und Numerischen Methoden zur Lsung von Integral- und Pseudodifferentialgleichungen (Analytic and numercal methods for the solution of integral- and pseudointegral equations)
	Presentation	Lecture
	Occasion	Winterschule des Weierstraß-Instituts der Akademie der Wissenschaften der DDR
	Location	Leisure residence of the Academy of Science of the GDR , Binz, GDR
	Date	??.??.86
	Title	Mehrdimensionale Realisierung eines allgemeinen Operatorenkalküls
	Presentation	Institutional seminar
	Occasion	Invitation by H. Malonek
	Location	Pädagogische Hochschule Halle-Köthen , Halle, GDR
	Date	11.06.1986
	Title	Funktionentheorie der Quaternionen und ihre Anwendungen (Analysis of quaternions and its applications)
	Presentation	Talk
	Occasion	Honorary Colloquium on the occasion of the retirement of Professor F. Rühs
	Location	TU Bergakademie Freiberg, Freiberg, GDR
	Date	??.10.86
	Title	Quaternionic analysis and its applications
	Presentation	Talk
	Occasion	Conference on Analytical and Numerical Treatment of Differential- and Integral Equations
	Location	Frankfurt/Oder, GDR
	Date	13.01.1987
	Title	A generalized Leibniz Rule and Foundation of a discrete Quaternionic Analysis
	Presentation	Talk
	Occasion	15. Winterschool on Geometry and Physics of the Czechoslovak Academy of Science
	Location	Srni, Czechoslovakia
	Date	06.05.1988
	Title	Quaternionic Analysis
	Presentation	Institutional Seminar
	Occasion	Invitation by Ch. Rezek
	Location	AGH Krakow (Partner University of TU Freiberg), Krakow, Polen
	Date	03.06.1988
	Title	Anwendungen der räumlichen Funktionentheorie in der theoretischen Physik (Applications of the multidimensional function theory in theoretical physics
	Presentation	Talk
	Occasion	Honorary Colloquium of the 65th Birthday of Hans Jäckel
	Location	TU Karl-Marx-Stadt,  Karl-Marx-Stadt, GDR
	Date	28.06.1988
	Title	Eine Operatormethode zur Lösung nichtlinearer Randwertprobleme (A operator method for the solution of non-linear boundary value problems)
	Presentation	Talk
	Occasion	9. TMP (Tagung ber Probleme und Methoden der Mathematischen Physik)
	Location	TU Karl-Marx-Stadt , Karl-Marx-Stadt, GDR
	Date	??.12.1988
	Title	On a Boundary Value Problem of Maxwell's Equations by using of Quaternions
	Presentation	Talk
	Occasion	5. Conference on Complex Analysis and Its Applications to Partial Differential Equations
	Location	University of Halle-Wittenberg, Halle, GDR
	Date	09.01.1989
	Title	Discrete Quaternionic Function Theory for the Solution of Navier-Stokes Equations
	Presentation	Talk
	Occasion	16. Winterschool on Geometry and Physics
	Location	Srni, Czechoslovakia
	Date	30.03.1989
	Title	Behandlung von Randwertproblemen mittels Quaternionenanalysis (Treatment of boundary value problems with quaternionic analysis)
	Presentation	Institutional seminar
	Occasion	Invitation by S. Proessdorf
	Location	Karl-Weierstra-Institute of the Academy of Science of GDR , Berlin, GDR
	Date	23.05.1989
	Title	Randkollokationsmethoden mit H-regulaeren Funktionen und ein hyperkomplexes Diskretisierungskonzept (Boundary collocation methods with $H$-regular functions and a hypercomplex conception of discretisation)
	Presentation	Institutional seminar
	Occasion	Invitation by W. Wendland
	Location	University of Stuttgart, Institute of Applied Mathematics,  Stuttgart, FRG
	Date	28.05.1989
	Title	On a decomposition of the quaternionic-valued Hilbert space L2;H(G)
	Presentation	Institutional seminar
	Occasion	Invitation by R. Delanghe
	Location	University of Ghent, Seminaire voor Algebra en Functionaalanalyse , Ghent, Belgium
	Date	30.05.1989
	Title	Boundary Collocation methods with H-regular Functions
	Presentation	Institutional seminar
	Occasion	Invitation by F. Brackx
	Location	University of Ghent, Engineering Faculty , Ghent, Belgium
	Date	31.05.1989
	Title	Anwendung der Quaternionentheorie zur Lsung rumlicher Randwertaufgaben (Application of quaternionic analysis for the solution of multidimensional boundary value problems)
	Presentation	Institutional seminar
	Occasion	Invitation by K. Habetha
	Location	RWTH Aachen, Department of Mathematics, Mathematisches Kolloquium, Aachen, FRG
	Date	05.06.1989
	Title	Eine neue Strategie zur Lsung räumlicher Rand- und Eigenwertprobleme (A new strategy for the treatment of Boundary-and eigenvalueproblems)
	Presentation	Institutional seminar
	Occasion	Invitation by U. Koschorke
	Location	Universität Gesamthochschule Siegen, Mathematisches Kolloquium, Siegen, FRG
	Date	18.09.1989
	Title	Discrete Hypercomplex Function Theory and Applications in Numerical Mathematics
	Presentation	Invited lecture
	Occasion	2nd International Conference Clifford Algebras and their Applications
	Location	University of Montpellier, Montpellier, France
	Date	20.09.1989
	Title	Lower Bounds for the First Eigenvalue of the Dirac Operator
	Presentation	Talk
	Occasion	2nd International Conference Clifford Algebras and their Applications
	Location	University of Montpellier,  Montpellier, France
	Date	26.02.1990
	Title	On methods of quaternionic analysis for the computation of lower eigenvalue bounds
	Presentation	Lecture
	Occasion	Tagung Eigenwertaufgaben in Natur- und Ingenieurwissenschaften und ihre numerische Behandlung (Conference on eigenvalue problems in natural sciences and engineering and its numerical treatment}
	Location	Mathematisches Forschungsinstitut Oberwolfach, Oberwolfach, FRG
	Date	01.10.1990
	Title	An Operator Calculus in Clifford Structures
	Presentation	Institutional seminar
	Occasion	Invitation by P. Lounesto
	Location	Helsinki University of Technology, Espoo, Finland
	Date	03.10.1990
	Title	Treatment of Eigenvalue and Boundary Value Problems by Clifford Algebra Techniques
	Presentation	Colloquiums talk
	Occasion	Colloquium of the Finnish Academy of Science
	Location	Helsinki University , Helsinki, Finland
	Date	19.12.1990
	Title	Elliptische Randwertprobleme im Quaternionenkalkül (Elliptic boundary value problems in quaternionic calculus)
	Presentation	Lecture
	Occasion	Invitation-Meeting for mathematicians from the former GDR
	Location	FU Berlin,  Berlin, Germany
	Date	22.03.1991
	Title	Quaternionic analysis and boundary value problems -- new aspects
	Presentation	Lecture
	Occasion	Workshop ''Mathematische Analyse bruchmechanischer Probleme'' (Mathematical analysis of fracture-mechanical problems)
	Location	TH Darmstadt,  Darmstadt, Germany
	Date	29.05.1991
	Title
	Presentation	Lecture
	Occasion	Workshop Analysis in höheren Dimensionen und Funktionentransformationen (Analysis in higher dimensions and function transforms)
	Location	TU Chemnitz,  Chemnitz, Germany
	Date	26.07.1991
	Title	Quaternionic Analysis and Applications to Elliptic Boundary Value Problems
	Presentation	Talk
	Occasion	13th World Congress on Computation and Applied Mathematics und Angewandte Mathematik
	Location	Trinity College, Dublin, Ireland
	Date	15.11.1991
	Title	Anwendung von Quaternionenanalysis auf stationäre Navier-Stokes-Probleme mit freier Konvektion (Application of quaternionic analysis to the stationary Navier-Stokes problem with free convection
	Presentation	Institutional seminar
	Occasion	Invitation by K. Doppel
	Location	FU Berlin,  Berlin, Germany
	Date	04.12.1991
	Title	Zur hyperkomplexen Behandlung elliptischer Randwertaufgaben (Hypercomplex treatment of elliptic boundary value problems)
	Presentation	Institutional seminar
	Occasion	Invitation by H. Leutwiler
	Location	Friedrich Alexander University Erlangen-Nuremberg, Nuremberg, Germany
	Date	16.03.1992
	Title	On the function theory od the disturbed Dirac operator
	Presentation	Talk
	Occasion	Tagung Elliptische Randwertaufgaben (Conference on elliptical boundary value problems)
	Location	Hochschule für Seefahrt Warnemünde-Wustrow (University for Nautics Warnemünde-Wustrow,  Wustrow, Germany
	Date	15.06.1992
	Title	Analisi ipercomplessa e problemi al contorno (Hypercomplex analysis and problems in domains)
	Presentation	Lecture
	Occasion	Invitation by E. Venturino
	Location	University of Catania,  Catania, Italy
	Date	19.06.1992
	Title	Methodi di collocazione sul contorno H-regulori (H-regular Collocation methods in domains)
	Presentation	Institutional seminar
	Occasion	Invitation by E. Venturino
	Location	University of Catania , Catania, Italy
	Date	10.09.1992
	Title	A new application of quaternionic analysis
	Presentation	Lecture
	Occasion	Symposium on Hyperkomplexe Analysis -- Transformationen -- New Applications of Quaternionic Analysis
	Location	Waldgasthof Teichhaus,  Holzhau, Germany
	Date	26.09.1992
	Title	Hypercomplex Function Theory and Stokes Problems
	Presentation	Invited lecture
	Occasion	Max Born - Symposium
	Location	Sobotka castle , Sobotka, Poland
	Date	04.03.1993
	Title	Methods of quaternionic analysis for the treatment of Navier-Stokes equations
	Presentation	Talk
	Occasion	ECMI93 (European Consortium for Mathematics in Industry) 7th Conference
	Location	Therme Excelsior,  Montecatini Terme, Italy
	Date	06.05.1993
	Title	Quaternionic Operator Calculus and Domain Perturbation Problems
	Presentation	Talk
	Occasion	3th International Conference Clifford Algebras and their Applications (ICCA)
	Location	De Ceder , Deinze, Belgium
	Date	19.08.1993
	Title	Some Remarks on Analysis in Clifford Algebras
	Presentation	Invited lecture
	Occasion	19th International Summer School Applications of Mathematics in Engineering
	Location	Varna, Bulgaria
	Date	07.10.1993
	Title	Applications of hypercomplex Methods to disturbed Boundary Value Problems
	Presentation	Talk
	Occasion	Workshop on Mathematical Problems in Continuum Mechanics
	Location	TU Darmstadt,  Darmstadt, Germany
	Date	08.11.1993
	Title	Quaternionic Analysis and Problems in Electrodynamics
	Presentation	Instituional seminar
	Occasion	Invitation by B. Jancewicz
	Location	University of Wroclaw, Chair on theoretical physics , Wroclaw, Poland
	Date	09.03.1994
	Title	Quaternionic analysis
	Presentation	Instituional seminar
	Occasion	Invitation by L. Fortuna
	Location	University of Catania (Dipartimento Elettrico, Elettronio e Sistenistico) , Catania, Italia
	Date	07.04.1994
	Title	Multivector Analysis and Boundary Value Problems
	Presentation	Talk
	Occasion	Annual GAMM meeting
	Location	TU Braunschweig ,Braunschweig, Germany
	Date	16.05.1994
	Title	Multivektoranalysis und Randwertprobleme der mathematischen Physik (Multivector analysis and boundray value problems in mathematical physics)
	Presentation	Lecture
	Occasion	Invitation by R. Schimming
	Location	University of Greifswald,  Greifswald, Germany
	Date	28.06.1994
	Title	Treatment of problems in mechanics of viscous flows by quaternionic methods Presentation: two introductional lectures
	Presentation
	Occasion	Erasmus stay
	Location	University of Aveiro , Aveiro, Portugal
	Date	08.07.1994
	Title	Quaternionic analysis and boundary value problems
	Presentation	Institutional seminar
	Occasion	Invitation by F.O. Speck
	Location	Mathematical Faculty of the University of Lisbon , Lisbon, Portugal
	Date	12.12.1994
	Title	On the treatment of some classes of boundary value problems by methods of quaternionic Analysis
	Presentation	Talk
	Occasion	Internationale Conference Operator Theory for Complex and Hypercomplex Analysis
	Location	IPN , Mexico-City, Mexico
	Date	08.05.1995
	Title	Applications of quaternionic analysis
	Presentation	Instituional seminar
	Occasion	Invitation by R. Delanghe
	Location	Rijcks-University Ghent,  Ghent, Belgium
	Date	21.06.1995
	Title	About hyercomplex analysis in quaternions
	Presentation	Institutional seminar
	Occasion	Invitation by E. Venturino
	Location	University of Catania, Catania, Italy
	Date	15.09.1995
	Title	On the treatment of uid problems by methods of Clifford analysis
	Presentation	Lecture
	Occasion	IMACS-COST Conference on computational fluid mechanics and three-dimensional complex flows
	Location	EPFL,  Lausanne , Switzerland
	Date	08.11.1995
	Title	Zur Behandlung von Randwertaufgaben partieller Differentialgleichungen mit analytischen Mitteln der Quaternionentheorie (On the treatment of boundary value problems of partial differentail equations with analytic means of the quaternionic analysis)
	Presentation	Institutional seminar
	Occasion	Invitation by E. Meister
	Location	TU Darmstadt,  Darmstadt, Germany
	Date	28.05.1996
	Title	On a class of non-linear boundary value problems
	Presentation	Lecture
	Occasion	4th International Conference on Clifford Algebras and their Applications (ICCA)
	Location	RWTH Aachen,  Aachen, Germany
	Date	14.06.1996
	Title	Uber nichtlineare Randwertaufgaben mit Mitteln der Quaternionen-Analysis (On non-linear boundary value problems with means of quaternionic analysis)
	Presentation	Invitational seminar
	Occasion	Invitation by K. Guerlebeck
	Location	Bauhaus-Universität Weimar,  Weimar, Germany
	Date	01.10.1996
	Title	On Classes of Nonlinear Boundary Value Problems dealt with Clifford Analytic Methods
	Presentation	Talk
	Occasion	Sommerfeld `96 - Workshop Modern Mathematical Methods in Diffraction Theory and its Applications in Engineering
	Location	Waldhotel Zollerblick,  Freudenstadt, Germany
	Date	07.06.1997
	Title	On the treatment of classes of non-linear boundary value problems by Clifford analytic methods
	Presentation	Talk
	Occasion	ISAAC Meeting
	Location	University of Delaware,  Newark, USA
	Date	28.09.1997
	Title	Quaternions and applications
	Presentation	Lecture
	Occasion	Erasmus Meeting
	Location	University of Sussex (holiday house) ,  Isle of Thorns, England
	Date	17.12.1997
	Title	Quaternionic and Clifford Analysis and their Applications
	Presentation	Institutional seminar
	Occasion	Invitation by T. Qian
	Location	University of New England,  Armidale, Australia
	Date	05.03.1998
	Title	Boundary Value Problems and Growth Problems by Hypercomplex Methods
	Presentation	Institutional seminar
	Occasion	Invitation by G. Sobczyk
	Location	Universidad de Las Americas, Puebla, Mexico
	Date	06.03.1998
	Title	Boundary value problems dealt with hypercomplex analysis
	Presentation	Institutional seminar
	Occasion	Invitation by M. Shapiro
	Location	ESFM of the IPN,  Mexico-City, Mexico
	Date	09.03.1998
	Title	On regular hypercomplex elementary functions and boundary value problems
	Presentation	Institutional semnar
	Occasion	Invitation by J. Ryan
	Location	Mathematics Colloquia of the University of Arkansas,  Fayetteville, USA
	Date	27.03.1998
	Title	Fueter's Ideas and Regular Elementary Functions
	Presentation	Introductional lectures
	Occasion	Erasmus stay
	Location	University of Aveiro,  Aveiro, Portugal
	Date	08.10.1998
	Title	Operators in Clifford Analysis and Boundary Value Problems
	Presentation	Invited lecture
	Occasion	Internationale Conference Dirac operators and applications
	Location	Grand Hotel San Michele , Cetraro, Italy
	Date	16.03.1999
	Title	Quaternionic Analysis for Problems in Fluid Mechanics
	Presentation	Institutional seminar
	Occasion	Reserach stay at the Analysis Research Group
	Location	University of Aveiro , Aveiro, Portugal
	Date	26.03.1999
	Title	Quaternionic analysis of boundary value problems in Magneto- Hydrodynamics
	Presentation	Talk
	Occasion	13. TMP in honour of Siegfried Prößdorf
	Location	Wasserschloss Klaffenbach,  Chemnitz, Germany
	Date	23.06.1999
	Title	On the construction of quaternionic regular elementary functions
	Presentation	Institutional seminar
	Occasion	Invitation by V. Kravchenko
	Location	Escuela Superior de Ingenieria Mechanica y Electrica des Instituto Politecnico Nacional, Mexico-City, Mexico
	Date	03.07.1999
	Title	Hypercomplex analysis in fluid mechanics
	Presentation	Plenary lecture
	Occasion	International Conference Clifford Algebras and their Applications in Mathematical Physics (ICCA)
	Location	Hotel Presidente Intercontinental Ixtapa, Ixtapa-Zihuantanejo, Mexico
	Date	18.08.1999
	Title	On hypercomplex boundary value problems in H. Begehr's work
	Presentation	Talk
	Occasion	2.ISAAC World Congress
	Location	Fukuoka University,  Fukuoka, Japan
	Date	19.08.1999
	Title	Quaternionic Analysis for special Boundary Problems in Fluid Mechanics
	Presentation	Talk
	Occasion	2. ISAAC World Congress
	Location	Fukuoka University, Fukuoka, Japan
	Date	03.09.1999
	Title	Geometrische und algebraische Aspekte der Analysis
	Presentation	Introductional lecture
	Occasion	Lehrerweiterbildung des Landes Thringen
	Location	Adolf-Reichwein-Gymnasium, Jena, Germany
	Date	03.11.1999
	Title	Clifford-Analysis und deren Anwendung auf Randwertaufgaben der mathematischen Physik (Clifford analysis and applications to boundary value problems in mathematical physics)
	Presentation	Faculty colloquium
	Occasion	Invitation by G. Hecht
	Location	TU Chemnitz Institute of Physics,  Chemnitz, Germany
	Date	14.01.2000
	Title	Über die Anwendung hyperkomplexer Methoden in der Strömungsmechanik (On the application of hypercomplex methods in fluid dynamics)
	Presentation	Institutional seminar
	Occasion	Invitation by B. Fauser
	Location	University of Konstanz, Institute of astrophysics , Konstanz, Germany
	Date	31.03.2000
	Title	On the origins of digits and numbers
	Presentation	Public student lecture
	Occasion	Invitation by E. Venturino
	Location	Politecnico Turin, Turin, Italy
	Date	21.01.2000
	Title	On a class of algebraic integrals
	Presentation	Institutional seminar
	Occasion	Invitation by K. Gürlebeck
	Location	Bauhaus-University Weimar , Weimar, Germany
	Date	17.04.2000
	Title	Modified Teodorescu transform with an application to the Landesman-Lazar problem
	Presentation	Talk
	Occasion	DFG-Workshop: New results on dynamic problems in continuum physics
	Location	TU Darmstadt ,  Darmstadt, Germany
	Date	28.04.2000
	Title	83 years Radon transform - a historical survey
	Presentation	Introductional lecture
	Occasion	Colloquium of the Analysis Research Group
	Location	University of Aveiro,  Aveiro, Portugal
	Date	03.08.2000
	Title	Teodorescu transform and eigenvalue problems
	Presentation	Key-Lecture
	Occasion	International Conference on Clifford Analysis, Its Applications and Related Topics
	Location	Olympic Hotel Beijing, Beijing, China
	Date	15.09.2000
	Title	Teodorescu type transforms and applications
	Presentation	Talk
	Occasion	Second IMA International Conference on Boundary Integral methods Theory and Applications
	Location	University of Bath, Bath, United Kingdom
	Date	03.10.2000
	Title	Clifford Analysis and Boundary Value Problems
	Presentation	Institutional seminar
	Occasion	Invitation by G. Laville
	Location	Departement de Mathematique an der Universite de Caen, Caen, France
	Date	31.10.2000
	Title	On a class of weak singular integral operators and its applications
	Presentation	Keylecture
	Occasion	NATO Advanced Research Workshop Clifford Analysis and its Applications
	Location	CDMS Krystal Prague,  Prague, Czechia
	Date	26.01.2001
	Title	Modified Teodorescu transform and Maxwell equations
	Presentation	Talk
	Occasion	GAMM Workshop Computational Electromagnetics
	Location	University of Kiel,  Kiel, Germany
	Date	29.06.2001
	Title	Quaternionic Analysis for Non-stationary Physical Processes
	Presentation	Talk
	Occasion	Computational Methods and Function Theory 2001 (CMFT)
	Location	University of Aveiro,  Aveiro, Portugal
	Date	20.07.2001
	Title	Quaternionic Calculus for Maxwell Equations
	Presentation	Talk
	Occasion	International Symposium Algorithms for Approximation IV
	Location	University of Huddersfield, Institute of Mathematics and Computer Science,  Huddersfield, England
	Date	09.08.2001
	Title	Maxwell Equations in Clifford Algebra Framework
	Presentation	Keylecture
	Occasion	International Conference on Finite or Infinite Dimensional Complex Analysis and Applications
	Location	TU Hanoi, Hanoi, Vietnam
	Date	20.05.2002
	Title	Clifford Calculus for Pseudoparabolic problems
	Presentation
	Occasion	6th Congress Clifford Algebras and their Applications to Mathematical Physics
	Location	University of Tennessee,  Cookeville , USA
	Date	18.08.2002
	Title	Galpern-Sobolev equations with non-constant coeffcients
	Presentation	Main-Lecture
	Occasion	International Conference on Clifford Analysis and its Applications Satellite Conference of the (CM 2002)
	Location	University of Macao,  Macao, People's Republic of China
	Date	10.06.2003
	Title	On the Galpern-Sobolev equation - representation theory
	Presentation	Talk
	Occasion	IKM 2003
	Location	Bauhaus-University of Weimar, Weimar, Germany
	Date	17.06.2003
	Title	Representation of solutions for pseudo-parabolic problems
	Presentation	Institutional seminar
	Occasion	Invitation by E. Venturino
	Location	Turin university , Torino, Italy
	Date	02.07.2005
	Title	Die Teodorescu-Transformation und deren Ntzlichkeit
	Presentation
	Occasion	60th Birthday of Manfred Tasche
	Location	Mecklenburger Workshop,  Hasenwinkel, Germany
	Date	20.11.2003
	Title	Erzeugende Operatoren in der Quaternionen- und Clifford-Analysis (Generating operators in quaternionic and Clifford analysis)
	Presentation	Institutional seminar
	Occasion	Invitation by J. Tolksdorf
	Location	University of Mannheim, Mannheim, Germany
	Date	05.12.2003
	Title	Analytical and Numerical methods in Clifford analysis On electromagnetic fields in a semiconductor with quaternionic analysis
	Presentation	Talk
	Occasion	Workshop Analytical and Numerical Methods in Clifford Analysis
	Location	Bauhaus-University Weimar,  Weimar, Germany
	Date	08.07.2004
	Title	Quaternionic Analysis in Applications (electromagnetic fields, fluid flow problems)
	Presentation	three lectures
	Occasion	Mini-Course
	Location	University of Aveiro,  Aveiro, Portugal
	Date	02.08.2004
	Title	Initial-value and Boundary value problems with hypercomplex methods and Applied Mathematics
	Presentation	Lecture
	Occasion	Intensive Course Summer School on Clifford Analysis and Applications
	Location	TU Tampere , Tampere, Finland
	Date	10.09.2004
	Title	Aspects of Cliffordanalysis in Applied Mathematics Chalkis
	Presentation	Plenary lecture
	Occasion	International Conference of Numerical Analysis and Appliactions (ICNAAM2004)
	Location	Universtiy of Peloponnes, Chalkis, Greece
	Date	18.06.2005
	Title	Quaternionic analysis in fluid dynamics
	Presentation	Talk
	Occasion	Talk at the 2nd joint AMS-DMV Meeting
	Location	University of Mainz , Mainz, Germany
	Date	16.09.2005
	Title	Equations of Fluid dynamics with non-linear viscosity in quaternionic setting
	Presentation	Talk
	Occasion	Minisymposium on Dirac Operators and Applications of the ICNAAM
	Location	Rhodos, Griechenland
	Date	27.09.2005
	Title	Equations of fluid dynamics and rheology in quaternionic setting
	Presentation	Overview Lecture
	Occasion	2nd International Course of the German Summer Academy Modelling of technical processes
	Location	TU Freiberg,   Freiberg, Germany
	Date	20.02.2006
	Title	Quaternionic and Cliffordanalysis with applications to fluid flow problems
	Presentation	6 Lectures
	Occasion	Lecture series as part of the program Technomathematics
	Location	Technical University Hanoi,  Hanoi, Vietnam
	Date	08.03.2006
	Title	Quaternionic analysis in fluid dynamics
	Presentation	Institutional seminar
	Occasion	Invitation by T. Qian
	Location	University of Macao, Department of Mathematics and Computer Science, Macao, People's Republic of China
	Date	23.05.2006
	Title	Applications of quaternionic analysis in fluid dynamics
	Presentation	Talk
	Occasion	SIMAI 2006, Session: Boundary integral equations; recent numerical developments and applications
	Location	Hotel Congressi Baia Samuele, Ragusa (Sicily), Italy
	Date	05.06.2006
	Title	Clifford algebra techniques and (initial) boundary value problems
	Presentation	Plenary talk
	Occasion	International Conference on Mathematical Modelling and Computation
	Location	University of Brunei-Darussalam, Darussalam, Sultanate of Brunei
	Date	13.07.2006
	Title	On fluid flow problems on the sphere
	Presentation	Talk
	Occasion	IKM 2006
	Location	Bauhaus-University Weimar , Weimar, Germany
	Date	20.07.2006
	Title	On the usefulness of quaternionic analysis
	Presentation	Institutional seminar
	Occasion	Invitation by G. Sommer
	Location	Christian-Albrechts-University of Kiel, Institute of Informatics and applied mathematics  Cognitive systems) , Kiel, Germany
	Date	16.09.2006
	Title	Forcasting equations in quaternionic fomulation
	Presentation	Talk
	Occasion	ICNAAM 2006, Symposium Applied Clifford Analsis
	Location	Hotel Imperial Belvedere,  Hersonissos , Greece (Crete)
	Date	26.04.2007
	Title	Quaternionic holomorphic functions in fluid dynamics and elasticity
	Presentation	Plenary talk
	Occasion	MATA2007
	Location	Westin Hotel , Cancun, Mexico
	Date	03.05.2007
	Title	Hodge decompositions and boundary value problems
	Presentation	Plenary talk
	Occasion	International Conference on Applied Analysis
	Location	Resort Hotel ''Mision'',  Queretaro, Mexico
	Date	18.06.2007
	Title	L-Holomorphic functions in elasticity and fluid dynamics
	Presentation	4 Lectures
	Occasion	13. European Intensive Course on Complex Analysis and applications to partial differential equations
	Location	Universities of Aveiro and Coimbra,  Aveiro and Coimbra, Portugal
	Date	03.09.2007
	Title	Navier-Stokes equations with thermal effects in complex-quaternionic setting
	Presentation	Invited talk
	Occasion	Workshop on Clifford Analysis and Applications
	Location	Hed Pand ,Ghent, Belgium
	Date	16.09.2007
	Title	Shallow water equations in quaternionic setting
	Presentation	Talk
	Occasion	ICNAAM 2007, Symposium Applied Clifford Analysis
	Location	Hotel Marbella,   Corfu, Greece
	Date	14.02.2008
	Title	Fluid flow equations with thermal effects in quaternionic setting
	Presentation	Institutional talk
	Occasion	Invitation by Le Hung Son
	Location	TU Hanoi, Hanoi, Vietnam
	Date	06.05.2008
	Title	Quaternionic Operator Methods with Applications to Initial-Boundary Value Poblems
	Presentation	Institutional talk
	Occasion	Invitation by V. Kisil
	Location	Department of Mathematics at the University of Leeds, Leeds, England
	Date	26.05.2009
	Title	Hydrodynamics with thermal and magnetic effects in complex quaternionic setting
	Presentation	Main talk
	Occasion	International Conference on Clifford Algebras and their Applications in Mathematical Physics (ICCA2008)
	Location	University of Campinas, Departments of Physics and Mathematics, Campinas, Brazil
	Date	08.06.2008
	Title	Fluid flow problems in compressible media
	Presentation	Talk
	Occasion	Mecklenburger Workshop Approximationsmethoden und schnelle Algorithmen (65th Birthday of M. Tasche)
	Location	Castle Hasenwinkel,  Hasenwinkel, Germany
	Date	12.06.2008
	Title	Erwin Papperitz als Mathematiker und Mitbegründer der DMV (Erwin Papperitz as mathematician and co-founder of the German Mathematical Society)
	Presentation	Lecture
	Occasion	Honory meeting on the occasion of the 150th birthday of E. Papperitz
	Location	TU Freiberg , Freiberg, Germany
	Date	19.08.2008
	Title	Fluid flow problems - an alternative conception
	Presentation	Plenary lecture
	Occasion	AGACE2008 (Applied Geometric Algebras in Computer Science and Engineering)
	Location	Hotel Kloster Nimbschen,  Grimma, Germany
	Date	27.08.2008
	Title	Basic principles in modeling and examples -- a survey with historical comments
	Presentation	2 lectures
	Occasion	International Course of the German Summer Academy Modelling of technical processes
	Location	TU Freiberg,   Freiberg, Germany
	Date	17.09.2008
	Title	Norm estimations of the modified Teodorescu transform with application to a multidimensional equation of Airy type (with A. Schlichting)
	Presentation	Talk
	Occasion	International Conference of Numerical Analysis and Applied Mathematics (ICNAAM2009)
	Location	Kyriotis International Conference Center Psalidi, Psalidi, Greece (Kos)
	Date	11.12.2008
	Title	Decomposition techniques and boundary value problems for vector fields and $Cl_n$-valued functions -- an overview
	Presentation	Talk
	Occasion	Workshop on Clifford analysis
	Location	Charles University Institute of Mathematics (Sokolovska ulica) , Prague, Czech Republic (Czechia)
	Date	11.02.2009
	Title	Quaternionic methods in mathematical physics
	Presentation	Talk
	Occasion	6th Vienna International Conference on Mathematical Modelling (MATHMOD2009)
	Location	Technical university of Vienna,  Vienna, Austria
	Date	30.06.2009
	Title	Fluid flow equations with thermal effects in complex-quaternionic setting
	Presentation	main talk
	Occasion	International Conference Analytic methods of mechanics and complex analysis
	Location	National Academy of Science of Ukraine , Kiev, Ukraine
	Date	07.07.2009
	Title	Operatior exponentials and harmonic extension for initial-boundary value problems
	Presentation	Talk
	Occasion	18th International Conference on the Applications of Computer Science and Mathematics in Architecture and Civil Engineering (IKM2009)
	Location	Bauhaus University of Weimar,  Weimar, Germany
	Date	13.07.2009
	Title	Initial-boundary value problems with quaternionic analysis
	Presentation	Talk
	Occasion	7th International ISAAC Congress
	Location	Department of Mathematics, Imperial College, London, England
	Date	06.08.2009
	Title	New aspects in the application of quaternionic analysis
	Presentation	Plenary talk
	Occasion	The 17th International Conference on finite or infinite dimensional complex analysis and applications
	Location	University of Pedagogy ,  Ho Chi Minh City (Saigon), Vietnam
	Date	22.09.2009
	Title	Exponentials of the Dirac operator and an application
	Presentation	Talk
	Occasion	ICNAAM2009 (International Conference of Numerical Analysis and Applied Mathematics)
	Location	Hotel AQUILA Rethymna Beach,   Rethymno, Greece  (Crete)
	Date	23.09.2009
	Title	Quaternionic analysis apllied to problems in elasticity
	Presentation	Institutional seminar
	Occasion	Invitation by Ioannis Stratis
	Location	Department of Mathematics, University of Athens,  Athens, Greece
	Date	08.10.2009
	Title	Initial-boundary value problems and complex quaternionic analysis
	Presentation	Invited lecture
	Occasion	Workshop on Advances and Trends in Integral Equations
	Location	Wasserschloss Klaffenbach ,Chemnitz, Germany
	Date	19.02.2010
	Title	Strong non-linear initial boundary value problems
	Presentation	Talk
	Occasion	Annual Workshop on hypercomplex Analysis and Applications
	Location	Universität Paderborn, Paderborn, Germany
	Date	30.03.2010
	Title	A. Quaternions -- space numbers; B: Quaternionic operator calculus
	Presentation	Institutional Seminar (2 h)
	Occasion	Invitation by Professor Du
	Location	School of Mathematics and Statistics, University of Wuhan, Wuhan, China
	Date	31.03.2010
	Title	A.Modified quaternionic operator calculus; B: Generalized holomorphy
	Presentation	Institutional Seminar (2 h)
	Occasion	Invitation by Professor Du
	Location	School of Mathematics and Statistics, University of Wuhan, Wuhan, China
	Date	07.04.2010
	Title	A: Incompressible fluid dynamics with quaternions B: Boussinesq approximation for the Poisson-Stokes problem
	Presentation	Institutional Seminar (2 h)
	Occasion	Invitation by Professor Du
	Location	School of Mathematics and Statistics, University of Wuhan, Wuhan, China
	Date	08.04.2010
	Title	A:Electromagnetic fields with quaternionic analysis; A: Flow phenomena in the earth atmosphere
	Presentation	Institutional Seminar (2 h)
	Occasion	Invitation by Professor Du
	Location	School of Mathematics and Statistics, University of Wuhan, Wuhan, China
	Date	25.05.2010
	Title	Quaternionic operator methods with applications to boundary value problems
	Presentation	Institutional Seminar
	Occasion	Invitation by Professor Anderson
	Location	University of Brunei-Darussalam, Darussalam, Sultanate of Brunei
	Date	15.07.2010
	Title	Non-linearities and quaternionic holomorphic functions
	Presentation	Invited talk
	Occasion	IWOTA; Session: Hypercomplex operator theory
	Location	TU Berlin, Berlin, Germany
	Date	15.07.2010
	Title	Electrodynamics with quaternions
	Presentation	Invited talk
	Occasion	IWOTA; Session: Operator theoretical methods in mathematical physics -- on the traces of E.Meister
	Location	TU Berlin, Berlin, Germany
	Date	28.07.2010
	Title	From Phragmen-Lindelöf type problems to basics of Clifford Analysis
	Presentation	Invited talk
	Occasion	Symposium in Complex and Hypercomplex Analysis and related topics - an attempt of a laudation for H. Malonek
	Location	University of Aveiro, Aveiro, Portugal
	Date	19.09.2010
	Title	Application of quaternionic analysis for a class of non-linear boundary value problems
	Presentation	Talk
	Occasion	ICNAAM2010; /.Symposium on Clifford Analysis and Appliactions
	Location	Hotel Thodos Palace, Rhodos, Greece
	Date	11.10.2010
	Title	Quaternionic analysis and non-linear flow problems
	Presentation	Invited lecture
	Occasion	International Symposium on Complex and Hypercomplex Analysis
	Location	IPN, Mexico-City, Mexico
	Date	04.12.2010
	Title	Clifford analysis -- a laudation to the 70th birthday of Richard Delanghe
	Presentation	Invited lecture
	Occasion	1-day Symposium in honour of Richard Delanghe -- the father of Clifford analysis
	Location	University of Ghent, Ghent, Belgium