Vinai, K. SinghKumar, Santosh2018-09-102018-09-10200973- 85http://hdl.handle.net/20.500.11810/4855In order to characterizations of best approximations have been given in 2-norm space (X, || .,|| ). Some generalization of the function phi-p of Dragomir type have been given in the context where the said generalization help to formulate the characterizations what have been proposed in this article.en2-Normed spaces, Best approximations and Phi- p functionsMapping Phi-p in normed linear spaces and characterization of orthogonality problem of best approximation in 2-normJournal Article, Peer Reviewed