Abstract
A few years after the creation of Fourier Integrals [6] by L. Hörmander and the possibility to look for normal forms, the mathematicians have first looked at operators of principal type (see for this subject [7]). It was then natural to start to look at operators with double characteristics.
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References
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Helffer, B. (2017). Operators with Double Characteristics. In: Guillemin, V., Sjöstrand, J. (eds) Louis Boutet de Monvel, Selected Works. Contemporary Mathematicians. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-27909-1_6
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DOI: https://doi.org/10.1007/978-3-319-27909-1_6
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