scholarly journals The Clar covering polynomial of hexagonal systems I

1996 ◽  
Vol 69 (1-2) ◽  
pp. 147-167 ◽  
Author(s):  
Heping Zhang ◽  
Fuji Zhang
Keyword(s):  
Hexagonal Systems ◽  
Clar Covering Polynomial

On the Quasi-Ordering of Catacondensed Hexagonal Systems with Respective to their Clar Covering Polynomials

2012 ◽  
Vol 67 (10-11) ◽  
pp. 550-558
Author(s):  
Liqiong Xu ◽  
Fuji Zhangb
Keyword(s):  
Hexagonal Systems ◽  
Clar Covering Polynomial ◽  
Quasi Ordering

In this paper, we discuss the quasi-ordering of hexagonal systems with respective to the coefficients of their Clar covering polynomials (also known as Zhang-Zhang polynomials). The last six minimal catacondensed hexagonal systems and the hexagonal chains with the maximum Clar covering polynomial are determined. Furthermore, the smallest pair of incomparable catacondensed hexagonal systems is given.

scholarly journals The Clar covering polynomial of hexagonal systems III

2000 ◽  
Vol 212 (3) ◽  
pp. 261-269 ◽  
Author(s):  
Heping Zhang ◽  
Fuji Zhang
Keyword(s):  
Hexagonal Systems ◽  
Clar Covering Polynomial

scholarly journals The energy of directed hexagonal systems

2013 ◽  
Vol 439 (7) ◽  
pp. 1825-1833 ◽  
Author(s):  
Juan Rada ◽  
Ivan Gutman ◽  
Roberto Cruz
Keyword(s):  
Hexagonal Systems

scholarly journals Z-transformation graphs of perfect matchings of hexagonal systems

1988 ◽  
Vol 72 (1-3) ◽  
pp. 405-415 ◽  
Author(s):  
Zhang Fu-ji ◽  
Guo Xiao-feng ◽  
Chen Rong-si
Keyword(s):  
Perfect Matchings ◽  
Z Transformation ◽  
Hexagonal Systems
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