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appearently , to the definition of number, 0 is a number:
1. A member of the set of positive integers; one of a series of symbols of unique meaning in a fixed order that can be derived by counting.
2. A member of any of the further sets of mathematical objects, such as negative integers and real numbers.
3. A numeral or a series of numerals used for reference or identification.
look at #2. A member of ANY OF THE FURTHER SETS OF MATHEMATICAL OBJECTS. and #3, zero is a numeral, is it not?

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