Journal of Mathematics of Kyoto University

Ellipticity of certain conformal immersions

Chung-Ki Cho and Chong-Kyu Han

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We study prolongation of the conformal embedding equations. Let $(\mathscr{M}, g)$ be a $C^{\infty}$ Riemannian manifold of dimension $n \geq 3$ and $(\tilde{\mathscr{M}}, \tilde{g})$ be a $C^{\infty}$ Riemannian manifold of dimension $n + d$, $d <\frac{1}{2}n(n-1)$. Suppose that $f : \mathscr{M} \to \tilde{\mathscr{M}}$ is a conformal immersion with conformal factor $v$. If the conformal 1-nullity off at a point $P \in \mathscr{M}$ does not exceed $n - 2$, we prove that the system of conformal embedding equations admits a prolongation to a system of nonlinear partial differential equations of second order which is elliptic at the solution $(f, v)$. In particular, if $(\mathscr{M}, g)$ and $(\tilde{\mathscr{M}}, \tilde{g})$ are analytic and $f$ and $v$ are of differentiability class $C^{2}$ then $f$ and $v$ are analytic on a neighborhood of $P$ in $\mathscr{M}$.

Article information

J. Math. Kyoto Univ., Volume 39, Number 4 (1999), 597-606.

First available in Project Euclid: 17 August 2009

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Digital Object Identifier

Mathematical Reviews number (MathSciNet)

Zentralblatt MATH identifier

Primary: 53C42: Immersions (minimal, prescribed curvature, tight, etc.) [See also 49Q05, 49Q10, 53A10, 57R40, 57R42]
Secondary: 53A30: Conformal differential geometry


Cho, Chung-Ki; Han, Chong-Kyu. Ellipticity of certain conformal immersions. J. Math. Kyoto Univ. 39 (1999), no. 4, 597--606. doi:10.1215/kjm/1250517816.

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