%0 Journal Article %T A NEW INEQUALITY AND IDENTITY %A DAM VAN NHI %J Journal of Science and Arts %D 2013 %I Bibliotheca Publishing House %X In this paper we introduce the new inequality and identity called (M, N), that Hayashi's inequality is only a special case. Then we will present some interesting applications. %K Hayashi's inequality %K triangle %K polygon. %U http://www.icstm.ro/DOCS/josa/josa_2013_1/a_01_Dam_Van_Nhi.pdf