The Existence and Multiplicity of Positive Solutions for Second-Order Periodic Boundary Value Problem

الملخص EN

The existence and multiplicity of positive solutions are established for second-order periodic boundary value problem.

Our results are based on the theory of a fixed point index for A-proper semilinear operators defined on cones due to Cremins.

Our approach is different in essence from other papers and the main results of this paper are also new.