caa a22 4500 46581879X CHVBK 20180323112130.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF00528882 doi (NATIONALLICENCE)springer-10.1007/BF00528882 On subspectral problem—benzenoid hydrocarbons with common eigenvalues ±1 [Elektronische Daten] [Y. Jiang, G. Chen] Summary: The method for the contraction and expansion of graphs is used to treat the subspectrality of benzenoid hydrocarbons in relation to eigenvalues ±1. Counts of benzenoid hydrocarbons together with degeneracies of eigenvalues have been carried out for all species having h ⩽ 7 hexagons. In addition, twelve homologous series are evaluated, and the closed results for the distribution of eigenvalues ± 1 and degeneracies in terms of the number of repeated units are tabulated. This method is universal and applicable to cases sharing other eigenvalues and to nonbenzenoid systems. Springer-Verlag, 1990 Benzenoid hydrocarbon nationallicence Hückel theory nationallicence Graph spectrum nationallicence Subspectrality nationallicence Jiang Y. Institute of Theoretical Chemistry, Jilin University, Changchun, People's Republic of China aut Chen G. Institute of Theoretical Chemistry, Jilin University, Changchun, People's Republic of China aut Theoretica chimica acta Springer-Verlag 76/6(1990-11-01), 437-450 0040-5744 76:6<437 1990 76 214 https://doi.org/10.1007/BF00528882 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00528882 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jiang Y. Institute of Theoretical Chemistry, Jilin University, Changchun, People's Republic of China aut NATIONALLICENCE 700 1- Chen G. Institute of Theoretical Chemistry, Jilin University, Changchun, People's Republic of China aut NATIONALLICENCE 773 0- Theoretica chimica acta Springer-Verlag 76/6(1990-11-01), 437-450 0040-5744 76:6<437 1990 76 214 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer