This paper is concerned with the following system@D^2u"1(k)+f"1(k,u"1(k),u"2(k))=0,k@?[0,T],@D^2u"2(k)+f"2(k,u"1(k),u"2(k))=0,k@?[0,T],u"1(0)=u"1(T+2)=0=u"2(0)=u"2(T+2).By using Leggett-Williams fixed point theorem, sufficient conditions are obtained for the existence of three positive solutions to the above system.
['Jian-Ping Sun', 'Wan-Tong Li']
Multiple positive solutions of a discrete difference system