讨论一类非线性奇异差分系统初值问题,通过运用微分不等式比较原理,上下解方法和单调迭代技术,对所构造的两个逼近解序列,使用Ascoli-Arzela′s定理,证明了其逼近解序列一致收敛于非线性问题的唯一解,同时,应用拟线性化方法证明了该逼近解序列收敛于唯一解的速度是二次的。
The initial value problem of nonlinear singular difference system is discussed.Using the differential inequality comparison principle,lower and upper solutions method and monotone iterative technique,and the Ascoli-Arzela's theorem,two approximate solution sequences both converge uniformly to the unique solution of the nonlinear problem are obtained.Meanwhile,by using the quasilinearizition method,it is shown that the speed of the solution sequences converging to the unique solution of the nonlinear problem is second order.