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Evolution of contractions by mean curvature flow

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Abstract

In this article we investigate length decreasing maps \(f:M\rightarrow N\) between Riemannian manifolds \(M\), \(N\) of dimensions \(m\ge 2\) and \(n\), respectively. Assuming that \(M\) is compact and \(N\) is complete such that

$$\begin{aligned} \sec _M>-\sigma \quad \text {and}\quad {\mathrm{Ric }}_M\ge (m-1)\sigma \ge (m-1)\sec _N\ge -\mu , \end{aligned}$$

where \(\sigma \), \(\mu \) are positive constants, we show that the mean curvature flow provides a smooth homotopy of \(f\) into a constant map.

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Correspondence to Andreas Savas-Halilaj.

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The first author is supported financially by the grant \(E\Sigma \Pi A\): PE1-417.

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Savas-Halilaj, A., Smoczyk, K. Evolution of contractions by mean curvature flow. Math. Ann. 361, 725–740 (2015). https://doi.org/10.1007/s00208-014-1090-y

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