On the solvability of systems of pseudodifferential operators
(2011) In Progress in Mathematics 292. p.121-159- Abstract
This paper studies the solvability for square systems of classical pseudodifferential operators. We assume that the system is of principal type, i.e., the principal symbol vanishes of first order on the kernel. We shall also assume that the eigenvalues of the principal symbol close to zero have constant multiplicity. We prove that local solvability for the system is equivalent to condition (ψ) on the eigenvalues of the principal symbol. This condition rules out any sign changes from - to + of the imaginary part of the eigenvalue when going in the positive direction on the bicharacteristics of the real part. Thus we need no conditions on the lower order terms.We obtain local solvability by proving a localizable a priori estimate for the... (More)
This paper studies the solvability for square systems of classical pseudodifferential operators. We assume that the system is of principal type, i.e., the principal symbol vanishes of first order on the kernel. We shall also assume that the eigenvalues of the principal symbol close to zero have constant multiplicity. We prove that local solvability for the system is equivalent to condition (ψ) on the eigenvalues of the principal symbol. This condition rules out any sign changes from - to + of the imaginary part of the eigenvalue when going in the positive direction on the bicharacteristics of the real part. Thus we need no conditions on the lower order terms.We obtain local solvability by proving a localizable a priori estimate for the adjoint operator with a loss of 3/2 derivatives (compared with the elliptic case).
(Less)
- author
- Dencker, Nils LU
- organization
- publishing date
- 2011-01-01
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Principal type, Pseudodifferential operator, Solvability, Systems of differential equations
- host publication
- Geometric Aspects of Analysis and Mechanics : In Honor of the 65th Birthday of Hans Duistermaat - In Honor of the 65th Birthday of Hans Duistermaat
- series title
- Progress in Mathematics
- volume
- 292
- pages
- 39 pages
- publisher
- Springer
- external identifiers
-
- scopus:85028058098
- ISSN
- 2296-505X
- 0743-1643
- ISBN
- 978-0-8176-8243-9
- 978-0-8176-8244-6
- DOI
- 10.1007/978-0-8176-8244-6_5
- language
- English
- LU publication?
- yes
- id
- de0d8c69-a0d9-432d-83e5-73f48f634bb3
- date added to LUP
- 2019-06-24 10:44:45
- date last changed
- 2025-04-04 14:37:55
@inbook{de0d8c69-a0d9-432d-83e5-73f48f634bb3,
abstract = {{<p>This paper studies the solvability for square systems of classical pseudodifferential operators. We assume that the system is of principal type, i.e., the principal symbol vanishes of first order on the kernel. We shall also assume that the eigenvalues of the principal symbol close to zero have constant multiplicity. We prove that local solvability for the system is equivalent to condition (ψ) on the eigenvalues of the principal symbol. This condition rules out any sign changes from - to + of the imaginary part of the eigenvalue when going in the positive direction on the bicharacteristics of the real part. Thus we need no conditions on the lower order terms.We obtain local solvability by proving a localizable a priori estimate for the adjoint operator with a loss of 3/2 derivatives (compared with the elliptic case).</p>}},
author = {{Dencker, Nils}},
booktitle = {{Geometric Aspects of Analysis and Mechanics : In Honor of the 65th Birthday of Hans Duistermaat}},
isbn = {{978-0-8176-8243-9}},
issn = {{2296-505X}},
keywords = {{Principal type; Pseudodifferential operator; Solvability; Systems of differential equations}},
language = {{eng}},
month = {{01}},
pages = {{121--159}},
publisher = {{Springer}},
series = {{Progress in Mathematics}},
title = {{On the solvability of systems of pseudodifferential operators}},
url = {{http://dx.doi.org/10.1007/978-0-8176-8244-6_5}},
doi = {{10.1007/978-0-8176-8244-6_5}},
volume = {{292}},
year = {{2011}},
}