%0 Journal Article %T On Two Methods for Computing the Non-Rigid Group of Molecules %J Iranian Journal of Mathematical Sciences and Informatics %V 3 %N 2 %U http://ijmsi.ir/article-1-53-en.html %R 10.7508/ijmsi.2008.02.003 %D 2008 %K Non-rigid group, the Computer Algebra System GAP, Character table, HNT., %X In this paper, two methods are described, by means of which it is possible to calculate the non rigid group of molecules consisting of a number of XH3 groups attached to a rigid framework. The first method is a combination of the wreath product formalism of Balasubramanian and modern computer algebra and the second method is a computational approach by using group theory package GAP. We apply these methods on 2,3,6,7,10,11-hexanitrotriphenylene (HNT) to compute its non-rigid group. %> http://ijmsi.ir/article-1-53-en.pdf %P 21-28 %& 21 %! %9 Research paper %L A-10-1-51 %+ %G eng %@ 1735-4463 %[ 2008