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it's not just set theory; it varies with authors in all sorts of fields
Natural numbers are the positive [[integers]], 1, 2, 3, 17, 100, etc. In [[set theory]], zero is also included.
Natural numbers are the positive [[integers]], 1, 2, 3, 17, 100, etc. In some formulations, zero is also included.
[[Category:Mathematics]]
[[Category:Mathematics]]