M. MURUGAN 1, P. SRIRAMAN 2, M. SURIYA 3 1. Department of Mathematics, School of Science,
Tamil Nadu Open University, Chennai, INDIA.
e-mail: muruganganesan@yahoo.in
2. Department of Mathematics, School of Science,
Tamil Nadu Open University, Chennai, INDIA.
3. B.Tech (Mechanical), Second Year,
SRM Institute of Science and Technology, Chennai, INDIA
In this paper we introduce the notion of λ- edge span of a graph, where λ is the λ -number or L(2; 1) labeling number of a graph. Also, we introduce the concept of almost regularness for infinite graphs. An infinite graph is almost regular if it is regular except for a finite number of points. Here, we consider some important infinite graphs which are al-most regular and find the λ -number and λ -edge span of them.
