Theorem 3 (See [8]) Let n E Nno and g (n, u, v) be a decreasing function in u and v for anY fixed n. Suppose that for n 2 no, the inequalities Yn+1 < g (n, Yn, Yn-1 < Un+1 hold. Then Yno-1 Uno-1, Yno < Uno implies that Yn < Un, n > no. Consider the scalar kth-order linear difference equation x (n + k) + P1 (n)x (n + k – 1) + ·+ Pk(n)x (n) = 0, (4) where k is a positive integer and p; : Z+ → C for i = 1, - ..., k. Assume that qi = lim p:(n), i = 1, . .. , k, (5) %3D exist in C. Consider the limiting equation of (4): x (n + k) + q1x (n + k – 1) +..+ qkx (n) = 0. (6)
Theorem 3 (See [8]) Let n E Nno and g (n, u, v) be a decreasing function in u and v for anY fixed n. Suppose that for n 2 no, the inequalities Yn+1 < g (n, Yn, Yn-1 < Un+1 hold. Then Yno-1 Uno-1, Yno < Uno implies that Yn < Un, n > no. Consider the scalar kth-order linear difference equation x (n + k) + P1 (n)x (n + k – 1) + ·+ Pk(n)x (n) = 0, (4) where k is a positive integer and p; : Z+ → C for i = 1, - ..., k. Assume that qi = lim p:(n), i = 1, . .. , k, (5) %3D exist in C. Consider the limiting equation of (4): x (n + k) + q1x (n + k – 1) +..+ qkx (n) = 0. (6)
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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