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In the article 'Estimates for minimal hypersurfaces' of Schoen Simon and Yau, at (1.16), it asserts that $\triangle h_{ij}= \sum_{k}^{} h_{ijkk}$ . Why does this equality hold?

luyao
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    Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Mar 06 '22 at 07:03
  • Your formula in not readable. Please lear Latex basics: $\Delta h_{ij}=...$ – Jean Marie Mar 06 '22 at 07:13
  • It follows by using the Codazzi-Mainardi equations and the identity you get when you switch the order of two covariant derivatives. – Deane Mar 06 '22 at 18:04

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