In mathematics, 1 stands for a unit, just like the ruler we usually use, 1 RMB or 1 meter long. It is the most basic unit, and other numbers are made up of it. In mathematics, 1 also stands for some special meanings. For example, 1 stands for the concept of divisor, which is usually used as the denominator in fractions to indicate the number of divisions. In addition, 1 also represents the smallest number among integers, which is the starting point of natural numbers and the turning point of positive and negative numbers.

1 is a very important number in mathematics, which is involved in many calculations. For example, when we multiply and divide a number, if a number is multiplied and divided by 1, then this number will not change, because a number is multiplied and divided by 1, which is equivalent to the number itself. In statistics, 1 is often used as a part of proportion. For example, the probability of an event is 1/4, which means that the probability of this event is a quarter of the original situation.

As one of the most basic numbers, 1 has also caused some interesting mathematical problems. For example, the idempotent property of 1 means that any power of 1 is equal to 1 itself, for example, the quadratic and cubic power of 1 are equal to 1. In addition, 1 also involves some important limit concepts in mathematics. For example, when the number of terms in an infinite series approaches infinity, if the size of each term is equal to 1, then the sum of the infinite series will be infinite.