Shimoda, Taishi Examples of globally hypoelliptic operator on special dimensional spheres without the bracket condition. (English) Zbl 1065.35101 Hokkaido Math. J. 34, No. 1, 219-235 (2005). MSC: 35H10 PDF BibTeX XML Cite \textit{T. Shimoda}, Hokkaido Math. J. 34, No. 1, 219--235 (2005; Zbl 1065.35101) Full Text: DOI Euclid OpenURL
Shimoda, Taishi Examples of globally hypoelliptic operator on special dimensional spheres without infinitesimal transitivity. (English) Zbl 1034.35015 Proc. Japan Acad., Ser. A 78, No. 7, 112-115 (2002). MSC: 35H10 PDF BibTeX XML Cite \textit{T. Shimoda}, Proc. Japan Acad., Ser. A 78, No. 7, 112--115 (2002; Zbl 1034.35015) Full Text: DOI OpenURL