[Definition]: The so-called logic is "relationship" in mathematical language, and the method of "dividing one into two" according to its own cycle is r (,) "∈"; " ∪"? " .

Attached drawing: Logical types (variables) represented by two-dimensional geometric models.

Q: What is the core content of Taoist thought?

A: The classification method of Taoism is different from other schools. For the two-in-one method, right? r(，)"∈"； ∨"；" ∪"?" In other words, it includes not only dialectical logic, but also formal logic.