Stability for almost periodic systems

Author(s):  
Taro Yoshizawa
1941 ◽  
Vol 63 (4) ◽  
pp. 794 ◽  
Author(s):  
Norbert Wiener ◽  
Aurel Wintner

1997 ◽  
Vol 55 (2) ◽  
pp. 177-184 ◽  
Author(s):  
V. I. Tkachenko

It is proved that in every neighbourhood of a system of linear differential equations with almost periodic skew-adjoint matrix with frequency module ℱ there exists a system with frequency module contained in the rational hull of ℱ possessing all almost periodic solutions.


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