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Asymptotic behavior of a sequence defined by iteration with applications

Stevo Stević — 2002

Colloquium Mathematicae

We consider the asymptotic behavior of some classes of sequences defined by a recurrent formula. The main result is the following: Let f: (0,∞)² → (0,∞) be a continuous function such that (a) 0 < f(x,y) < px + (1-p)y for some p ∈ (0,1) and for all x,y ∈ (0,α), where α > 0; (b) f ( x , y ) = p x + ( 1 - p ) y - s = m s ( x , y ) uniformly in a neighborhood of the origin, where m > 1, s ( x , y ) = i = 0 s a i , s x s - i y i ; (c) ( 1 , 1 ) = i = 0 m a i , m > 0 . Let x₀,x₁ ∈ (0,α) and x n + 1 = f ( x , x n - 1 ) , n ∈ ℕ. Then the sequence (xₙ) satisfies the following asymptotic formula: x ( ( 2 - p ) / ( ( m - 1 ) i = 0 m a i , m ) ) 1 / ( m - 1 ) 1 / n m - 1 .

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