minuend and subtrahend
7 - 3
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A set of real numbers is closed under subtraction when you take two real numbers and subtract , the answer is always a real number .
It depends on your definition of whole numbers. The classic definition of whole numbers is the set of counting numbers and zero. In this case, the set of whole numbers is not closed under subtraction, because 3-6 = -3, and -3 is not a member of this set. However, if you use whole numbers as the set of all integers, then whole numbers would be closed under subtraction.
Difference
In subtraction, the minuend minus the subtrahend equals the difference.
The set of rational numbers is closed under all 4 basic operations.