what does it mean natural numbers are closed under addition
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The natural numbers are "closed"under addition and multiplication. A set is closed (under an operation) if and only if the operation on any two elements of the set produces another element of the same set. ... The addition of two natural numbers creates another natural number.
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The natural numbers are "closed"under addition and multiplication. A set is closed (under an operation) if and only if the operation on any two elements of the set produces another element of the same set. ... The addition of two natural numbers creates another natural number.
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