Second and Third Extremals of Catacondensed Hexagonal Systems with respect to the PI Index
|
|
|
|
|
|
|
|
نویسنده
|
YARAHMADI ZAHRA ,MORADI SIROUS
|
|
منبع
|
iranian journal of mathematical chemistry - 2010 - دوره : 1 - شماره : 1 - صفحه:95 -103
|
|
چکیده
|
The padmakar-ivan (pi) index is a wiener-szeged-like topological index which reflects certain structural features of organic molecules. the pi index of a graph g is the sum of all edges uv of g of the number of edges which are not equidistant from the vertices u and v. in this paper we obtain the second and third extremals of catacondensed hexagonal systems with respect to the pi index.
|
|
کلیدواژه
|
Topological index; PI index; catacondensed hexagonal system.
|
|
آدرس
|
islamic azad university, Faculty of Science, Department of Mathematics, ایران, arak university, Faculty of Science, Department of Mathematics, ایران
|
|
پست الکترونیکی
|
s-moradi@araku.ac.ir
|
|
|
|
|
|
|