TURKISH JOURNAL OF MATHEMATICS, cilt.38, sa.3, ss.419-425, 2014 (SCI-Expanded)
The index and the period of an element a of a finite semigroup are defined as the smallest values of m >= 1 and r >= 1 such that a(m+r) = a(m), respectively. If m = 1 then a is called an element of index 1. The aim of this paper is to find some properties of the elements of index 1 in T-n, which we call transformations of index 1.