SOLUTION: what does it mean when it says: 'closd (under an operation)' ?

Question 781166: what does it mean when it says: 'closd (under an operation)' ?
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
This is the closure property
A set is closed under an operation if and only if the operation on two elements of the set produces another element of the set. If an element outside the set is produced, then the operation is not closed.
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