Regular versus singular order of contact on pseudoconvex hypersurfaces

Abstract

The singular and regular type of a point on a real hypersurface $\mathcal{H}$ in ${\mathbb{C}}^n$ are shown to agree when the regular type is strictly less than 4. If $\mathcal{H}$ is pseudoconvex, we show they agree when the regular type is 4. A non-pseudoconvex example is given where the regular type is 4 and the singular type is infinite.

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