We provide a representation of elements of the space for a locally convex space and and determine its continuous dual for normed space and . In particular, we study the extension and characterization of isometries on space, when is a normed space with an unconditional basis and with a symmetric norm. In addition, we give a simple proof of the main result of G. Ding (2002).
"Some Properties of Spaces." Abstr. Appl. Anal. 2009 1 - 8, 2009. https://doi.org/10.1155/2009/562507