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Professional Activity 
I referee papers for the following journals

SIAM Journal on Applied Mathematics
 Canadian Mathematical Bulletin
 Journal of the London Mathematical Society
 Bulletin of the London Mathematical Society
 Proceedings of the Edinburgh Mathematical Society
 Glasgow Mathematical Journal
 Proceedings of the American Mathematical Society
 Nonlinear Analysis, Series A: Theory, Method and Applications
 Nonlinear Analysis, Series B: Real World Applications
 Journal of Mathematical Analysis and Applications
 Mathematical and Computer Modelling
 Computers and Mathematics with Applications
 Applied Mathematics Letters
 Journal of Computational and Applied Mathematics
 Discrete and Continuous Dynamical Systems_A
 Discrete and Continuous Dynamical Systems_B
 Electronic Journal of Differential Equations
 Journal of Applied Mathematics and Stochastic Analysis
 International Journal of Mathematical and Mathematical Science
 Fixed Point Theory and Applications
 Acta Mathematical Sinica (by the Chinese Academy of Sciences)
 Dynamics of Continuous, Discrete and Impulsive Systems (Series A)
 Differential Equations and Dynamical Systems
 Indian Journal of Pure and Applied Mathematics
 Journal of the Malaysia Mathematical Society
 Mathematische Nachrichten
 Communications in Nonlinear Science and Numerical Simulations
 Arabian Journal of Mathematics
 Invited Seminar Lectures 
I was invited to give a seminar talk at University of Toronto, March 16, 2012.
Title: Nonzero positive solutions of systems of
elliptic boundary value problems
I was invited to give a seminar talk at University of Guelph, November 29, 2011.
Title: The evolution of predatorprey systems in ecology
I was invited to give a seminar talk at University of Waterloo, Canada, November 26, 2009.
Title: The evolution of predatorprey systems in ecology
I was invited to give a seminar talk at the Royal Military College of Canada, January, 2002.
Title: Eigenvalue criteria for existence of multiple positive solution of Hammerstein integral equations with singularities.

Exchange Visitor 
I visited University of Puget Sound, Tacoma, Washington, U.S.A during 19921993 
Membership of Mathematical Societies 
 Canadian Mathematical Society (CMS) (Past)
 International Federation of Nonlinear Analysts (IFNA) (Past)
 American Mathematical Society (AMS) (Past)
 Edinburgh Mathematical Society (Past)

Visitors 
 2007
 Professor Ravi P. Agarwal
, Department of Mathematics, Florida Institute of Technology, Melbourne, FL 32901, USA
 2003
 Prof. Ratnasingham Shivaji
Department of Mathematics, Mississippi State University.
Multiple Positive Solutions for Classes of pLaplacian Equations.
November 25, 2003
 2002
 Prof G. Isac from the Royal Military College of Canada gave a seminar talk in the department. October, 2002.

