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Published online by Cambridge University Press: 08 January 2001
The semi-classical asymptotic behaviour of the Riesz means of a distribution of eigenvalues is investigated at a non-critical energy level. For Schrödinger type operators, the second term related to the periodic trajectories of the classical Hamiltonian is obtained. This oscillating term is explained for Riesz means of order 1 with the aim of discussing a Lieb–Thirring conjecture.