Spectral Theory of Differential Operators

Self-Adjoint Differential Operators

af V.A. Il'in

In this fully-illustrated textbook, the author examines the spectral theory of self-adjoint elliptic operators. The author's work offers a novel method for estimation of the remainder term of a spectral function and its Riesz means without recourse to the traditional Carleman technique and Tauberian theorem apparatus.