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Natural numbers are the can either be an element of the set {1, 2, 3,...} or an element of the set {0, 1, 2, 3,...} which are respectively positive and non-negative [[integers]]. Positive integers are generally used in number theory, while non-negative integers are favored in mathematical logic, set theory, and computer science.

Natural numbers are the nonnegative integers {0, 1, 2, 3,...}, according to most modern mathematics and logic textbooks. Older books sometimes exclude zero, as there is a long history of people thinking that zero is unnatural or not really a number.

[[Category:Mathematics]]

[[Category:Mathematics]]