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Theoretical analysis demonstrates the regularity of analytic pseudodifferential operators across ultradifferentiable classes, extending Treves’ characterization of hypoellipticity.
We show that analytic pseudodifferential and Fourier integral operators behave well for ultradifferentiable classes satisfying minimal regularity properties. As an application we investigate the ultradifferentiable regularity properties of several examples of analytic differential operators. In particular we extend Treves’ characterization of the hypoellipticity of analytic operators of principal type to the ultradifferentiable category.
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Stefan Fürdös (2026) studied this question.
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