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![C [subscript] 0-groups, commutator methods and spectral theory of N-body hamiltonians](https://covers.openlibrary.org/b/isbn/0817653651-M.jpg?default=false)
This paper is concerned with certain estimates on the asymptotic behaviour of the functions [italic]u defined on an interval (a, [infinity symbol]) with values in a Hilbert space [italic]H. More precisely, if [italic]L is a second order ordinary differential operator the coeffic…