In
mathematics, a natural number can mean either an element of the set , , , ...} (i.e the
positive integers or the counting numbers) or an element of the set , 1, 2, 3, ...} (i.e. the
non-negative integers). The former is generally used in
number theory, while the latter is preferred in
mathematical logic,
set theory and
computer science. See below for a formal definition.
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