I. Deepening of definitions and concepts

In the mathematical system, every integer has a unique predecessor and a unique successor. The predecessor is what we call "number one" and the successor is "number one". Taking natural numbers as an example, this relationship between numbers forms a continuous and endless chain. This continuity is an important feature of mathematics.

Second, the previous number of 14 was 13.

When we mention "the last number of 14", we are actually looking for the predecessor of 14 on the number axis. On the number axis, each point represents a number, and the distance between points is uniform, representing the difference between numbers. To find the precursor of 14, we only need to move a unit distance in the opposite direction of the number axis, which is exactly 1.

Third, the relationship between mathematics and real life.

This concept of "the first number" and "the last number" is not limited to math books or classrooms. In our daily life, we often use this description. For example, when we queue up, list dates or describe a series of events, we often use "previous" or "next" to indicate a specific place or time.

Natural number sequence and its relationship in mathematics

1, natural number sequence

The natural number sequence is a positive integer sequence starting from 1: 1, 2, 3, 4 ... In this sequence, each number has a "front" and a "back" number. For example, 2 is preceded by 1 and 2 is followed by 3.

2. "Before" and "After" in mathematics

In mathematics, "before" and "after" are relative concepts. For any given number, we can find a leading number and a trailing number. For example, for the number 5, the number "before" is 4 and "after" is 6.

3. Application example

This concept of context is not only useful in mathematics, but also widely used in life. For example, when describing time, date or project arrangement, we always use the concepts of "before" and "after".