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math.AP2007
Existence of positive solutions for nonlinear systems
Jifeng Chu, Donal O'Regan, Meirong Zhang
This paper deals with the existence of positive solutions for the nonlinear system q(t)ϕ(p(t)u'_{i}(t)))'+f^{i}(t,\textbf{u})=0,\quad 0<t<1,\quad i=1,2,...,n. This system often ari…
math.PR2007
Quotient probabilistic normed spaces and completeness results
Bernardo Lafuerza-Guillen, Donal O'Regan, Reza Saadati
We introduce the concept of quotient in PN spaces and give some examples. We prove some theorems with regard to the completeness of a quotient.