3.1 Closure under Addition definition
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A set of integer numbers is closed under addition if the addition of any two elements of the set produces another element in the set. If an element outside the set is produced, then the set of integers is not closed under addition. As with whole numbers, when we add a positive number we move to the right.
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Example: when we add two real numbers we get another real number. 3.1 + 0.5 = 3.6. This is always true, so: real numbers are closed under addition.
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