Andrzej Nowakowski & Aleksandra Orpel 
         
Abstract:
 
  Using variational methods, we study the existence of positive 
  solutions for a nonlocal boundary-value problem with vector-valued
  response. We develop duality and variational principles for this 
  problem and present a numerical version which enables the 
  approximation of solutions and gives a measure of a duality gap
  between primal and dual functional for approximate solutions
  for this problem.
 Submitted February 27, 2002. Published May 28, 2002. 
Math Subject Classifications: 34B18.
Key Words: Nonlocal boundary-value problems, positive
           solutions, duality method, variational method. 
  
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Aleksandra Orpel 
Faculty of Mathematics, University of Lodz, 
Banacha 22, 90-238 Lodz, Poland 
e-mail: orpela@math.uni.lodz.pl