Department of Mathematics, Western Kentucky University, Bowling Green, KY 42101, USA
Copyright © 2009 Nguyen Thanh Lan. This is an open access article distributed under the
Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
For the differential equation , on a
Hilbert space , we find the necessary and sufficient conditions that the above-mentioned equation has a unique almost periodic solution. Some applications are also