Abstract
We prove in details the higher codimensional version of Theorem 1.1 [11]. This provides a complete proof of Fefferman’s SAK Principle for a class of PDO’s with symplectic characteristic manifold.
Keywords: A priori estimates, General theory of PDO’s
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Maniccia, L., Mughetti, M. Fefferman’s SAK principle and a priori estimates for second order operators. Ann. Univ. Ferrara 52, 337–352 (2006). https://doi.org/10.1007/s11565-006-0025-2
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DOI: https://doi.org/10.1007/s11565-006-0025-2