0 is neither positive nor negative, but a number between positive and negative. When a certain number x is greater than 0 (X>0), it is called a positive number; On the contrary, when x is less than 0 (x

1 is the smallest positive integer, the second smallest positive natural number (including 0), the smallest positive odd number and rational number. The first thing expressed through the unit. A whole consisting of one or several things can be regarded as the unit 1. For example, a circle can be regarded as the unit 1, and dividing it into three parts is the unit "1" divided by three to get one third. Is an integer between 0 and 2. The nth time of 1 is 1.