GRAPHS

Seena V^{1}, Raji Pilakkat^{2}

^{1,2}Department of Mathematics

University of Calicut

Malappuram (District), PIN 673 635, Kerala, INDIA

University of Calicut

Malappuram (District), PIN 673 635, Kerala, INDIA

- At least one of and is isolated;
- There exists an edge such that either is incident with but not with or is incident with but not with .

In this paper we discuss graphs and some examples of it. This paper also deals with the sufficient conditions for join of two graphs, middle graph of a graph and corona of two graphs to be . It is established via example that the line graph of a graph need not be . Moreover, the relations between graph with its incidence matrix and its adjacency matrix is discussed.

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