1 Introduction
The concept of (m,n)-ideal of a semigroup was introduced by Lajos [2]. The left almost semigroup (LA-semigroup), was first introduced by Kazim and Naseerudin [1]. Later, Mushtaq [3, 4] and others investigated this idea further and added many useful results to the theory of LA-semigroups. Mushtaq and Yusuf produced useful results [4], on locally associative LA-semigroups in 1979. In locally associative LA-semigroups they defined powers of an element and congruences using these powers. In this paper, we discussed some properties of (m,n)-ideals in a locally associative LA-semigroup.