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Some classical theorems in spectral theory revisited. (English) Zbl 0452.35093

Seminar on singularities of solutions of linear partial differential equations, Inst. Adv. Study, Princeton 1977-78, Ann. Math. Stud. 91, 219-259 (1979).

MSC:

35P20 Asymptotic distributions of eigenvalues in context of PDEs
35A20 Analyticity in context of PDEs