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Generalized Reflection Coefficients
I consider general reflection coefficients for arbitrary one-dimensional whole line differential or difference operators of order 2. These reflection coefficients are semicontinuous functions of the operator: their absolute value can only go down when limits are taken. This implies a corresponding semicontinuity result for the absolutely continuous spectrum, which applies to a very large class ...
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ژورنال
عنوان ژورنال: Acta Metallurgica
سال: 1966
ISSN: 0001-6160
DOI: 10.1016/0001-6160(66)90190-8