The theory of "six-dimensional space" is also called the theory of six-dimensional separation. This theory can be expressed in a popular way: "There will be no more than six people between you and any stranger, that is, you can know any stranger through six people at most." This theory came into being in the 1960s and was put forward by American psychologist Meyer Glenn.

At the beginning of 1998, two researchers from Cornell University explained how six billion people are connected with others through six kinds of "connections" by constructing a mathematical model of social network-"small world model", thus opening the source of social network research.

For this theory, I didn't use the complicated method of mathematical model to verify it. I used a rough method: since two people were introduced by six people, it must have been introduced seven times. At present, the world's population is 6.5 billion. I made the square root of 6.5 billion seven times, and the result is 25.2257. Even if you count 26, then if you meet the conclusion of six dimensions, everyone must have contact with at least 26 people in society-at least the kind that can be introduced.

26 contacts, I think it is a very conservative figure: there are more than 50 students in each class in the school, and there are more than 20 relatives of one person. Plus colleagues, there should be 100. So the conclusion of six-dimensional space is credible.

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