ABSTRACT
We consider the nonlinear boundary value problem − u " = f ( t , u ) https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003072140/faeac70b-e389-4ea4-8b5b-5a836c2a1f73/content/eq1785.tif"/> with linear boundary conditions and establish criteria for the existence of several positive solutions via fixed point index theory.
