Separation Problem for Bi-Harmonic Differential Operators in Lp− spaces on Manifolds

Author

Faculty of Science, Department of Mathematics, Zagazig University, Zagazig, Egypt

https://doi.org/10.1186/s42787-019-0029-6

Abstract

Consider the bi-harmonic differential expression of the form
A = 2M2 + q
on a manifold of bounded geometry (M, g) with metric g, where M is the scalar
Laplacian on M and q ≥ 0 is a locally integrable function on M.
In the terminology of Everitt and Giertz, the differential expression A is said to be
separated in Lp (M), if for all u ∈ Lp (M) such that Au ∈ Lp (M), we have qu ∈ Lp (M). In
this paper, we give sufficient conditions for A to be separated in Lp (M),where
1 < p < ∞

Keywords