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Keywords:
elliptic operators; eigenfunctions; Fourier series; hyperbolic equation
elliptic operators; eigenfunctions; Fourier series; hyperbolic equation
Summary:
The Fourier expansion in eigenfunctions of a positive operator is studied with the help of abstract functions of this operator. The rate of convergence is estimated in terms of its eigenvalues, especially for uniform and absolute convergence. Some particular results are obtained for elliptic operators and hyperbolic equations.
References:
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