... FX∼n1 and functions δi, i 0, 1, ,n,suchthatδijδji for j ∈ X δnmis a Kronecker symbol: δnm 1ifm n ,and nm 0ifm/ n,formabasis of this linear space. S o, for all ... equivalent to detA/ 0 for M n. In this case, we can easily get an expression for Green’s function in representation5.5 from the Kramer formula or from the formula for u A−1f.IfA−1gij,thenGijgij for ... ProblemsVolume 2011, Article ID 767024, 23 pagesdoi:10.1155/2011/767024 Research Article Green’s Function for Discrete Second-OrderProblems with Nonlocal Boundary ConditionsSvetlana Roman and Art ¯urasˇStikonasInstitute...