Sergey Shchogolev
abstract:
For the linear homogeneous system of differential equations, coefficients of 
which are represented by an absolutely and uniformly convergent Fourier series 
with slowly varying coefficients and frequency, the conditions of existence of 
the linear transformation with coefficients of similar structure leading this 
system to a block-diagonal form in a special case are obtained.
Mathematics Subject Classification: 34C20, 34C25
Key words and phrases: Linear systems of the differential equations, periodic solutions, slowly varying parameters