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Boundary value problems for discrete equations
(Elsevier BV, 1997-07-01)
Two existence results are presented for second-order discrete boundary value problems. The first result is based on the notion of upper and lower solutions and the second result is based on the discrete Gelfand problem.
Boundary value problems for general discrete systems on infinite intervals
(Elsevier BV, 1997-04-01)
This paper continues the study of boundary value problems for a discrete system which in particular includes the prototype equation x(k + 1) = f(k, x(k)), equations with finite as well as infinite delays, equations of ...