Bull. Korean Math. Soc. 2018; 55(2): 331-340
Online first article March 13, 2018 Printed March 30, 2018
https://doi.org/10.4134/BKMS.b160599
Copyright © The Korean Mathematical Society.
Jong Ryul Kim
Kunsan National University
Using the comparison of differential equations involving Ricci and scalar curvatures obtained by Eschenburg and O'Sullivan, the scalar curvatures of level hypersurfaces of geodesic spheres are compared.
Keywords: $H$-Jacobi tensor, Jacobi equation, mean curvature
MSC numbers: 53C20, 53C50
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