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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.

'''Natural numbers''' are the nonnegative [[integer]]s {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]]