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The spectrum of positive elliptic operators and periodic geodesics. (English) Zbl 0322.35071

Differ. Geom., Proc. Symp. Pure Math. 27, Part 2, Stanford 1973, 205-209 (1975).

MSC:

35P20 Asymptotic distributions of eigenvalues in context of PDEs
35S15 Boundary value problems for PDEs with pseudodifferential operators
58J40 Pseudodifferential and Fourier integral operators on manifolds