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</script>In this paper, two interesting eigenvalue comparison theorems for the first non-zero Steklov eigenvalue of the Laplacian have been established for manifolds with radial sectional curvature bounded from above. Besides, sharper bounds for the first non-zero eigenvalue of the Wentzell eigenvalue problem of the weighted Laplacian, which can be seen as a natural generalization of the classical Steklov eigenvalue problem, have been obtained.
Comments are welcome. 24 pages. A revised version will appear in Revista Matem\'{a}tica Complutense
Mathematics - Differential Geometry, Differential Geometry (math.DG), FOS: Mathematics, 35P15, 53C20
Mathematics - Differential Geometry, Differential Geometry (math.DG), FOS: Mathematics, 35P15, 53C20
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