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Definition of natural numbers is the same as non-negative numbers, so of course 0 is a natural number.
12 points
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In some countries, zero is neither positive nor negative. But in others, it is both positive and negative. So saying the set of natural number is the same as non-negative [integers] doesn’t really help. (Also, obviously not everyone would even agree that with that definition regardless of whether zero is negative.)
7 points
