Calcul exponentiel des opérateurs microdifférentiels d'ordre infini. I
Annales de l'Institut Fourier, Volume 33 (1983) no. 4, pp. 227-250.

This paper is concerned with the symbol calculus of microdifferential operators with exponential symbols. The composition law of exponential symbols is given. As an application, we find a sufficient condition of ellipticity for microdifferential operators of infinite order.

Cet article s’intéresse au calcul symbolique des opérateurs microdifférentiels avec symboles exponentiels. On donne la loi de composition des symboles exponentiels. Comme application, on trouve une condition suffisante d’ellipticité pour les opérateurs microdifférentiels d’ordre infini.

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     title = {Calcul exponentiel des op\'erateurs microdiff\'erentiels d'ordre infini. {I}},
     journal = {Annales de l'Institut Fourier},
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     publisher = {Institut Fourier},
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Aoki, Takashi. Calcul exponentiel des opérateurs microdifférentiels d'ordre infini. I. Annales de l'Institut Fourier, Volume 33 (1983) no. 4, pp. 227-250. doi : 10.5802/aif.947. http://archive.numdam.org/articles/10.5802/aif.947/

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