# Subtraction Function

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An subtraction function is an two-valued asymmetric arithmetic function where the negative value of the second operand is added with the first operand.

**AKA:**Subtraction, Subtract, Minus, −.- …

**Counter-Example(s):****See:**Additive Inverse Function.

## References

### 2009

- (Wikipedia, 2009) ⇒ http://en.wikipedia.org/wiki/Arithmetic#Subtraction_.28.E2.88.92.29
- Subtraction is essentially the opposite of addition. Subtraction finds the difference between two numbers, the minuend minus the subtrahend. If the minuend is larger than the subtrahend, the difference will be positive; if the minuend is smaller than the subtrahend, the difference will be negative; and if they are equal, the difference will be zero. Subtraction is neither commutative nor associative. For that reason, it is often helpful to look at subtraction as addition of the minuend and the opposite of the subtrahend, that is a − b = a + (−b). When written as a sum, all the properties of addition hold.