What does it mean if an integer is closed?

What does it mean if an integer is closed?
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Answer :

You don't say that "an integer is closed". It is the SET ofintegers which is closed UNDER A SPECIFIC OPERATION. For example,the SET of integers is closed under the operations of addition andmultiplication. That means that an addition of two members of theset (two integers in this case) will again give you a member of theset (an integer in this case).
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