en تخصصي Special پژوهشي Research paper <p>Let R be a fnite commutative ring and N(R) be the set of non unit elements of R. The non unit graph of R, denoted by Gamma(R), is the graph obtained by setting all the elements of N(R) to be the vertices and defning distinct vertices x and y to be adjacent if and only if x - yin N(R). In this paper, the basic properties of Gamma(R) are investigated and some characterization results regarding connectedness, girth and planarity of Gamma(R) are given.</p> Connectivity, Diameter, Girth, Planar graph, Clique. 95 106 http://ijmsi.ir/browse.php?a_code=A-10-1023-1&slc_lang=en&sid=1 A. R. Naghipour 10031947532846006287 10031947532846006287 Yes Shahrekord University