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- Gregório P Bessa, Luquésio P Jorge, Barnabé P Lima, José F Montenegro
- Anais da Academia Brasileira de Ciências
- 2006

We establish a method for giving lower bounds for the fundamental tone of elliptic operators in divergence form in terms of the divergence of vector fields. We then apply this method to the Lr operator associated to immersed hypersurfaces with locally bounded (r + 1)-th mean curvature Hr + 1 of the space forms Nn+ 1(c) of constant sectional curvature c. As… (More)

We obtain geometric estimates for the first eigenvalue and the fundamental tone of the p-laplacian on manifolds in terms of admissible vector fields. Also, we defined a new spectral invariant and we show its relation with the geometry of the manifold.

- Barnabé P Lima, Newton L Santos, Juscelino P Silva, Paulo A A Sousa
- Anais da Academia Brasileira de Ciencias
- 2016

The main goal of this paper is to present a complete description of all translation hypersurfaces with constant r -curvature S r , in the Euclidean space ℝ n + 1 , where 3 ≤ r ≤ n - 1 .

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