Another Look at the Invariance Principle for Wave Operators
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We give a new proof of the invariance principle for wave operators based on certain well-known properties of Calderón commutators. This method extends the invariance principle to a larger class of admissible functions. In particular, admissible functions need not be monotonic on any interval.
KeywordsLarge Class Invariance Principle Wave Operator Admissible Function
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