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http://dx.doi.org/10.7858/eamj.2018.004

SYMBOLS OF MINIMUM TYPE AND OF ZERO CLASS IN EXPONENTIAL CALCULUS  

LEE, Chang Hoon (Department of Mathematics, Korea Naval Academy)
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Abstract
We introduce formal symbols of product type, of zero class, and of minimum type and show that the formal power series representations for $e^p$ and $e^q$ are formal symbols of product type giving the same pseudodifferential operator, where p and q are formal symbols of minimum type and p - q is of zero class.
Keywords
Exponential calculus; Pseudodifferential operator; Symbol;
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