Dear Friends,
I need help with a result due to Levitan.
Please see the last paragraph of page 4 of the following paper: http://www.emis.de/journals/EJDE/2007/163/rath.pdf
Above, is the set of continuous functions bounded below and above by (here is a positive constant less than ) and , respectively, and that .Originally Posted by Author
I really need help about finding a book reference for Levitan's result.
Many thanks!
bkarpuz