Abstract
P-convexity with respect to singular supports has been completely characterized in geometrical terms when P is an operator of principal type. (See [2, section 1.4].) However, no satisfactory geometrical interpretation of P-convexity (with respect to supports) is known even when P is of real principal type as we shall assume throughout this paper.
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References
[1] L. Hörmander, Linear partial differential operators, Springer-Verlag, Berlin-Göttingen-Heidelberg, 1963.
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Hörmander, L. (2018). Remarks On Convexity With Respect To Operators Of Real Principal Type. In: Unpublished Manuscripts . Springer, Cham. https://doi.org/10.1007/978-3-319-69850-2_15
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DOI: https://doi.org/10.1007/978-3-319-69850-2_15
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