Mathematics, which originated from the early production activities of human beings, is one of the six great arts in ancient China, and is also regarded as the starting point of philosophy by ancient Greek scholars. Its evolution can be regarded as the continuous development of abstraction and the extension of theme. The first abstract concept is probably number, and its cognition of the common ground between two apples and two oranges is a great breakthrough in human thought. In addition to calculating the number of actual substances, human beings also know how to calculate the number of abstract substances, such as years and arithmetic.