In addition, in 2007, Shen Weixiao and Kozlovski, Van-Strien proved the Real Fatou conjecture: Real hyperbolic polynomials are dense in the space of real polynomials with fixed degree. This conjecture can be traced back to Fatou in the 1920s, and later Smale proposed him in the 1960s. Axiom A, and guess that the hyperbolic system should be dense in any system, but this is not true when the dimension is greater than or equal to 2, because there is homoclinic tangencies. The work of Shen Weixiao and others is equivalent to confirming that Smale's conjecture is correct in one dimension. The proof of Real Fatou conjecture is one of the most important developments in conformal dynamics in the past decade.