Gap in the essential spectrum of the Neumann problem for an elliptic system in a periodic domain
- First Online:
- Cite this article as:
- Nazarov, S.A. Funct Anal Its Appl (2009) 43: 239. doi:10.1007/s10688-009-0031-0
- 68 Downloads
We establish the existence of a gap in the essential spectrum of the Neumann problem for an elliptic formally self-adjoint system of second-order differential equations on a quasi-cylinder (a domain with periodically varying cross-section).