Ferra, Igor Ambo; Petronilho, Gerson On ultradifferentiable regularity of perturbations by lower order terms of globally \(C^\infty\) hypoelliptic ultradifferentiable pseudodifferential operators. (English) Zbl 1536.35145 J. Fourier Anal. Appl. 30, No. 1, Paper No. 3, 21 p. (2024). MSC: 35H10 35S05 × Cite Format Result Cite Review PDF Full Text: DOI
Ferra, Igor Ambo; Petronilho, Gerson Perturbations by lower order terms do not destroy the global hypoellipticity of certain systems of pseudodifferential operators defined on torus. (English) Zbl 1523.35129 Math. Nachr. 296, No. 7, 2780-2794 (2023). MSC: 35H10 35H20 35B20 35S05 × Cite Format Result Cite Review PDF Full Text: DOI