Nature is to understand the form of things from an objective point of view, and to understand the fundamental attributes that distinguish things from other things. Nature refers to the knowledge of arithmetic or formula directly derived from mathematical concepts. The concept of judgment proof, which is often used in mathematics, reflects the essence of things and infers the next conclusion on this basis.

Judgments in mathematics are often used to prove concepts in mathematics. Infer the next conclusion based on the essential attributes reflected by the essential attributes of things. This behavior is called judgment.

For example, two groups of parallelograms with parallel opposite sides are called parallelograms. As a proved theorem, this reveals the essence and can be said to be "forever established".

Based on this, this basis is called the judgment theorem. I found that a set of opposite sides of a quadrilateral are parallel and equal, so I can conclude that this quadrilateral is a parallelogram. This behavior is called judgment.

The essence of mathematics is the external and internal characteristics of mathematics, and it is the attribute that distinguishes one thing from other things. For example, the nature of parallelogram: the opposite sides are parallel, the opposite sides are equal, the diagonal lines are equally divided, and the center is symmetrical.