If you take two arbitrary numbers from a set N - lets say N stands for the natural numbers - and add them together, the sum will always be an element of N.(adsbygoogle = window.adsbygoogle || []).push({});

In my language, there is a word for this, but i dont know what it is in english? If i translate it from norwegian, it would be something like;

"The set N isclosedfor addition"

Is"closed"the correct word?

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# Is it called a closed set?

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