supported by the Austrian Science Fund FWF,Pro ject No.I01776
Let (M, θ) be a compact strictly pseudoconvex pseudonermitian manifold winch is CR embedded into a complex space. In an earlier paper, Lin and the authors gave several sharp upper bounds for the first positive eige...
supported by National Natural Science Foundation of China(Grant No.11001130)
In this paper, we first establish an abstract inequality for lower order eigenvalues of a self-adjoint operator on a Hilbert space which generalizes and extends the recent results of Cheng et al. (Calc. Var. Partial ...
This work is supported by Grant No.201/04/1077 of the Grant Agency of Czech Republic;by the Council of Czech Government MSM 6198959214
The paper presents the conditions which guarantee that for some positive value of μ there are positive solutions of the differential equation (Ф(x'))'+μQ(t, x, x') = 0 satisfying the Dirichlet boundary co...