数学季刊 ›› 2015, Vol. 30 ›› Issue (2): 172-183.doi: 10.13371/j.cnki.chin.q.j.m.2015.02.003
摘要: This paper is concerned with the nonlinear neutral functional difference equations△x(n) =-a(n)x(n) +h(n)f(n,x(n-T(n)),△x(n-δ(n))),where a,h and f are nonnegative sequences.Sufficient conditions for the existence of at least three positive T-periodic solutions are established by using a fixed point theorem due to Avery and Peterson.
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