What are the four operations?

Why do addition and multiplication conform to the laws of exchange, association and distribution?

4 What is a geometric figure?

5 Four-color conjecture

6 Fermat's last theorem

7 Goldbach conjecture

8 P (polynomial algorithm) problem versus NP (non-polynomial algorithm) problem

9 geometric ruler drawing problem

10 cell conjecture

1 1 twin prime conjecture

12 Hodge conjecture

13 poincare conjecture

14 riemann hypothesis

15 There is a quality gap in the poplar mill.

Existence and Smoothness of 16 Navier-Stokes Equation

17 Birch and Swinnerton-Dyer's guess

18. White matter and Swinerton-Dell conjecture (Birch and Swinerton-Dell

Guess)

19 Naville-Stokes equation (Naville-Stokes equation)

20 P problem versus NP problem (p versus NP problem)

Compatibility of 2 1 arithmetic axioms

Irrational Numbers and Transcendental Numbers of Some Numbers

23 the impossibility of solving algebraic equations of degree 7 only with binary functions