Subtraction is a mathematical operation that represents the operation of removing objects from a collection. It is signified by the minus sign (−). For example, in the picture on the right, there are 5 − 2 apples—meaning 5 apples with 2 taken away, which is a total of 3 apples. Therefore, 5 − 2 = 3. Subtraction represents removing or decreasing physical and abstract quantities using different kinds of objects including negative numbers, fractions, irrational numbers, vectors, decimals, functions, and matrices.

Subtraction follows several important patterns. It is anticommutative, meaning that c

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Woo Myung
If the past was the age of adding to one's mind, now is the age of subtracting what is in his mind. A person who subtracts his minds in this time will recover his original nature. ...more
Woo Myung, Stop Living In This Land, Go To The Everlasting World Of Happiness, Live There Forever

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