Bourdaud, Gérard Une algèbre maximale d’opérateurs pseudo-différentiels. (A maximal algebra of pseudo differential operators). (French) Zbl 0659.35115 Commun. Partial Differ. Equations 13, No. 9, 1059-1083 (1988). The author considers pseudo differential operators P in the class \(L^ 0_{1,1}\), i.e. \(P=p(x,D)\) where the symbol p(x,\(\xi)\) satisfies \[ | D^{\alpha}_ x D^{\beta}_{\xi} p(x,\xi)| \leq C_{\alpha \beta}(1+| \xi |)^{| \alpha | -| \beta |}. \] It is well known that P is not \(L^ 2\) continuous, in general. A characterization is given of the largest self-adjoint sub-algebra \({\mathcal A}\) of \({\mathcal L}(L^ 2)\) consisting of pseudo differential oprators in \(L^ 0_{1,1}\); precisely, the author proves that \({\mathcal A}=L^ 0_{1,1}\cap (L^ 0_{1,1})^*\), i.e. \(P\in {\mathcal A}\) if and only if the adjoint \(P^*\) is also well defined as operator in \(L^ 0_{1,1}\). Reviewer: L.Rodino Cited in 1 ReviewCited in 42 Documents MSC: 35S05 Pseudodifferential operators as generalizations of partial differential operators Keywords:symbol; characterization; largest self-adjoint sub-algebra PDFBibTeX XMLCite \textit{G. Bourdaud}, Commun. Partial Differ. Equations 13, No. 9, 1059--1083 (1988; Zbl 0659.35115) Full Text: DOI References: [1] Bourdaud G, Publ,Math.Univ.Paris 7 (1987) [2] Coifman R, Astérisque S.M.F 57 (1978) [3] DOI: 10.2307/2006946 · Zbl 0567.47025 · doi:10.2307/2006946 This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. In some cases that data have been complemented/enhanced by data from zbMATH Open. This attempts to reflect the references listed in the original paper as accurately as possible without claiming completeness or a perfect matching.