Descriptor purely arithmetical

These are purely arithmetical descriptors. Arithmetical descriptors that are not purely arithmetical since they depend on come from the mappings... 

Example (Arithmetical descriptors) We recall a few basic arithmetical descriptors - Let M = (e, y) M be a molecular graph. The purely arithmetic indices A and A are the counts of all or of the non-H atoms, obtained from the function A with its values... 

These descriptors are purely arithmetical, which is not the case for the descriptors arising from the following mappings ... 

These descriptors are not purely arithmetical. They may have different values for compounds of the same molecular formula (and of the same state distribution). They are nevertheless considered arithmetic descriptors since they are based merely on numbers of bonds. 

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