arXiv:2103.14325 [math.AP]AbstractReferencesReviewsResources Classifications Subjects Themes Keywords invariant subspaces, elliptic systems, distinct sign definite pseudodifferential operators, elliptic self-adjoint pseudodifferential operator, orthonormal pseudodifferential projections Tags Journal Information Publisher Journal Year Month Volume Number Pages DOI URL Miscellaneous Typesetting Pages Language License Submit Reset