What do you mean, I don't know.

Unknown refers to having certain limitations, being in a confused perceptual state, and the meaning of unknown existence.

Specific introduction:

1, only one is known, and the other is unknown: the description is not comprehensive. To "know only one, but not the other".

2. Knowing one thing but not knowing two: refers to the number in algebraic expressions or equations that can only be determined by operation. It also refers to things that have not yet been understood.

3. Unknown encounter: wèizhιwànyι: one in ten thousand don't know. Describe superficial knowledge.

The significance of mathematics:

When it comes to the basic spirit of mathematics, it is to find out the laws and properties hidden behind things. If you can draw a theory that is applicable to the whole through several concrete examples, that is, find out the law (induction), then you can capture the infinite world behind you through seemingly limited things. Therefore, the use of unknowns is the human feelings left by predecessors.

On the other hand, if we want to apply these laws and properties to individual situations (deduction), we need to use the unknown formula. Therefore, if you want to learn mathematics well, you must master the application of unknowns in formulas.

Finally, I will introduce you to a problem that mathematicians have never come to a regular pattern, that is, the prime number problem. A prime number is a number that can be divisible by 1 and the number itself, but not by any other number, for example, 2, 3, 5, 7,1,13, 17, 19.

As a basic number, prime number is extremely important in mathematics. However, the presentation of prime numbers is very irregular, and people have not yet found out the law of prime numbers.

The "Riemann conjecture" published by 1852 is a conjecture about the arrangement law of prime numbers. However, so far no one can prove the correctness of this conjecture. This is the famous puzzle of the Millennium Prize (Clay Institute of Mathematics), with a prize as high as $654,380,000 (this puzzle was not solved until July 2065,438+02).