Iteration and differential equations II: Small divisors

2011 ◽  
pp. 67-91
Keyword(s):  
Differential Equations ◽  
Small Divisors

scholarly journals Reducibility for real analytic quasi-periodic linear systems

1976 ◽  
Vol 21 (3) ◽  
pp. 289-298 ◽  
Author(s):  
G. C. O'Brien
Keyword(s):  
Differential Equations ◽  
Linear Systems ◽  
Linear Differential Equations ◽  
Small Divisors ◽  
Accelerated Convergence ◽  
Periodic Linear ◽  
Constant Coefficients ◽  
Real Analytic ◽  
Linear Differential ◽  
Method Of Accelerated Convergence

AbstractIn this paper we examine the linear differential equations x′ = Ax + P(φ)x, φ′ = ω where x ∈ Rn, φ ∈ Rm, A and ω are constant and P(φ) is real analytic and periodic in φ. We use the method of accelerated convergence to overcome the small divisors problem and reduce this system to the system y′ = By, φ′ = ω with constant coefficients.This problem has already been examined by Mitropolśki and Samolenko but the calculations and details in their work are formidable and difficult to follow. Besides being simpler our method provides more precise estimates at all stages and can be extended to the differentiable case to provide a significant improvement over previous results.

Partial Differential Equations

2020 ◽  
Author(s):  
A. K. Nandakumaran ◽  
P. S. Datti
Keyword(s):  
Partial Differential Equations ◽  
Differential Equations ◽  
Partial Differential
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