Shahrood University of Technology Journal of Algebraic Systems 2345-5128 2 1 2014 09 01 APPROXIMATE IDENTITY IN CLOSED CODIMENSION ONE IDEALS OF SEMIGROUP ALGEBRAS 53 59 301 10.22044/jas.2014.301 EN B. Mohammadzadeh Department of Mathematics, Babol University of Technology, Babol, Iran. Journal Article 2013 07 17 Let S be a locally compact topological foundation semigroup with identity and Ma(S) be its semigroup algebra. In this paper, we give necessary and sufficient conditions to have a bounded approximate identity in closed codimension one ideals of the semigroup algebra $M_a(S)$ of a locally compact topological foundation semigroup with identity. https://jas.shahroodut.ac.ir/article_301_7ee4ea8311e307d1890f997207da12dd.pdf