0 looks monotonous, but it's not. In fact, it is very rich and hides a lot. Zero is special in mathematics. No matter what you do, you should consider zero.

In several places, "0" is often used as a marker.

The uniqueness of "0" comes from some concepts or problems, such as every number has a reciprocal, but "0" has no reciprocal. And positive and negative numbers. "0", a number is divided into one category. Isn't this special? In divisor, only 0 cannot be divided. 0 is the dividend. No matter what number you divide (except "0"), you will get 0.

We often ignore 0, but it plays an important role. Like what's the problem? Some people can't think of "0". When counting, some people will forget zero. For example, how many integers are there that are not greater than 5 and not less than -5? Someone will have eight. Actually, there are still 0. For example, which numbers are not bigger in absolute value than themselves? That's positive numbers and zeros (also called non-negative numbers).

Zero is more colorful in life. At the parent-teacher conference after the end of the semester, when the teacher registered the wrong book for parents to see, we all hoped that our boxes would be marked with "0", indicating that we had done nothing wrong, and parents were happy and we were happy. But we don't want to see this number or an integer close to this number on paper, otherwise the day of going home will be sad. Nobody wants to get "0" in the competition.

0 is money. I think 0 is a trap in the problem, so we should consider 0 more in the future. 0 is wonderful and rich.