Document Type : Original paper
Fast NUCES, Lahore, Pakistan.
In the extension of irregularity indices, Abdo et. al.  deﬁned the total irregu-
larity of a graph G = (V, E) as irrt(G) = 21 Pu,v∈V (G) du − dv, where du denotes
the vertex degree of a vertex u ∈ V (G). In this paper, we investigate the total
irregularity of trees with bounded maximal degree Δ and state integer linear pro-
gramming problem which gives standard information about extremal trees and it
also calculates the index.