BB>
BB>  > I think the word should be whole-number not integer.                
BB>                                                                        
BB>     What is the difference? :-) Oh ... 0 is an integer, but not a whole
BB> number. The nature of zero is metaphysics or Zen philosophy rather than
BB> mathematics, isn't it?                                                 

0 is a whole number, whole numbers are non-negative integers....

probably I should have said "natural number" = positive integer.
(or counting number, 1,2,3... )
                        

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