A graph-theoretical method for stepwise factorisation of symmetric graphs for simultaneous determination of eigenvectors and eigenvalues |
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Authors: | Kali Kinkar Datta and Asok K Mukherjee |
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Institution: | (1) Chemistry Department, Burdwan Raj College, 713 104 Burdwan, India |
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Abstract: | A simple pictorial algorithm for factorisation of symmetric chemical graphs (weighted and unweighted) leading to simultaneous
determination of their eigenvalues and eigenvectors has been devised. The method does not require group-theoretical techniques
(viz. identification of the point group of the species under study, formation of symmetryadopted linear combinations using
character tables etc.). It requires consideration of only one symmetry element, e.g., a reflection plane and is based on elementary
row and column operations which keep the secular determinant of the adjacency matrix unchanged (except possibly for a multiplicative
constant). |
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Keywords: | Symmetric graphs adjacency operator adjacency matrix reflection plane linear combination of bases secular determinant |
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