© Feng Guo. 2008
Received: 10 December 2007
Accepted: 18 June 2008
Published: 8 July 2008
We consider the classes of periodic functions with formal self-adjoint linear differential operators , which include the classical Sobolev class as its special case. With the help of the spectral of linear differential equations, we find the exact values of Bernstein -width of the classes in the for .
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