On Hypoellipticity of the Operator $\exp[−|x_1|^{−σ}]D_1^2 + x_1^4 D_2^2 + 1$

Nobuo Nakazawa; Seiichiro Wakabayashi

doi:10.2977/prims/1145476419

JournalsprimsVol. 38, No. 1pp. 135–146

On Hypoellipticity of the Operator $exp [- ∣ x_{1} ∣^{- σ}] D_{1}^{2} + x_{1}^{4} D_{2}^{2} + 1$

Nobuo Nakazawa
University of Tsukuba, Ibaraki, Japan
Seiichiro Wakabayashi
University of Tsukuba, Ibaraki, Japan

$On Hypoellipticity of the Operator $\exp[−|x_1|^{−σ}]D_1^2 + x_1^4 D_2^2 + 1$ cover$

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Nobuo Nakazawa, Seiichiro Wakabayashi, On Hypoellipticity of the Operator $exp [- ∣ x_{1} ∣^{- σ}] D_{1}^{2} + x_{1}^{4} D_{2}^{2} + 1$ . Publ. Res. Inst. Math. Sci. 38 (2002), no. 1, pp. 135–146

DOI 10.2977/PRIMS/1145476419