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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeNov 23rd 2017
• (edited Nov 23rd 2017)

I gave the definition of symbol order its own entry (an estimate on the decay of the principal symbol of a (psedo-)differential operator that enters the assumptions of the propagation of singularities theorem).

Maybe there is a better name for this? The literature refers to it mostly only in formal notation as “$q \in S^m_{\rho, \delta}(X)$”.