NUMBER SYSTEM

Does someone say it isn't?

It's usually this:

Natural Numbers: 1, 2, 3, 4, ...
Whole Numbers: 0, 1, 2, 3, 4... (Natural Numbers and Zero)
Integers: ...-2, -1, 0, 1, 2... (Whole Numbers and their negatives, but don't count zero twice.)
 
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