Mathematics, which originated from early human production activities, 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 or the extension of theme. The first abstract concept is probably number, and its cognition that two apples and two oranges have something in common is a great breakthrough in human thought. In addition to how to calculate the number of actual substances, human beings also know how to calculate the number of abstract substances, such as years. Arithmetic will naturally come into being.