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Essential self-adjointness of real principal type operators
Published 12 Dec 2019 in math.AP, math-ph, math.MP, and math.SP | (1912.05711v1)
Abstract: We study the essential self-adjointness for real principal type differential operators. Unlike the elliptic case, we need geometric conditions even for operators on the Euclidean space with asymptotically constant coefficients, and we prove the essential self-adjointness under the null non-trapping condition.
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