Existence of positive solutions to secon
โ
Tadeusz Jankowski
๐
Article
๐
2009
๐
Elsevier Science
๐
English
โ 678 KB
## a b s t r a c t In this paper, we discuss four-point boundary value problems for impulsive second order differential equations with deviating arguments. We investigate separately, cases when arguments are of delayed or advanced types. We formulate sufficient conditions under which our problems h