Summary of Formulas and Definitions

All extremal single coronoids A are naphthalenic. The circular single coronoids 0 are also extremal they form a subclass of the A systems. Some expressions for circumscribing naphthalenic single coronoids, C, are given below. 

Asshme that C(n 5) is a naphthalenic single coronoid. If C can be circumscribed and C (7ip5 ) = circum-C(7i s), then 

A circwnextremal single coronoid P(nP 5 ) is a circumscribed extremal single coronoid, viz. drcum—A, or a isomer of drcum—A. An expression for riP is given in eqn. (5.57). 

A ground form G(tIq 5q) of single coronoids is an extremal single coronoid which is not drcumextremal. The formula (tiq Sq) is the first term in a sequence of associated formulas  

Expressions for Balaban picture and in the new picture have also been 

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