摘要: The existence of positive solutions to second-order periodic BVPs-u"+Mu=f(t, u),u(0)=u(2π),u'(0)=u"(2π) and u"+ Mu=f(t, u), u(0)=u(2π), u'(0)=u'(2π)is proved by a simple appliCation of a Fixed point Theorem in cones due to Krasnoselskii.
蒋达清. ON THE EXISTENCE OF POSITIVE SOLUTIONS TO SECOND ORDER PERIODIC BVPS[J]. 数学物理学报(英文版), 1998, 18(S1): 31-35.
Jiang Daqing. ON THE EXISTENCE OF POSITIVE SOLUTIONS TO SECOND ORDER PERIODIC BVPS[J]. Acta mathematica scientia,Series B, 1998, 18(S1): 31-35.