None, because the set of integers and the set of whole numbers is the same.
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Integers are closed under subtraction, meaning that any subtraction problem with integers has a solution in the set of integers.
Integers are whole numbers, both positive and negative. Therefore, adding and subtracting integers would be adding and subtracting whole numbers. Examples: 8+2 -8+2 8-2 -8-2
Subtraction means addition of the additive inverse. For two numbers a and b, we say a-b when we mean a + (-b) where -b is a number with the property that b + -b = 0. This applies to all real numbers, which of course includes integers.
Integers are whole numbers as for example 28 minus 17 = 11
They are different in the same way that subtraction of integers is different from their addition.