| Definition: | element of the unlimited sequence {0, 1, 2, 3,...} Note 1 to entry: The operations of addition and multiplication are defined for any two natural numbers. Note 2 to entry: There is a total order on the set of natural numbers. Note 3 to entry: The set of natural numbers is denoted by ℕ (N with oblique bar doubled), or N, or sometimes N with left vertical bar doubled. This set without zero is denoted by an asterisk to the symbol, for example ℕ*.
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