Mathematics is an infinite science. -Herman Weil The problem is the core of mathematics. -P.R. halmos As long as a branch of science can ask a lot of questions, it is full of vitality, while the lack of questions indicates the termination or decline of independent development. One of the characteristics of some beautiful theorems in Hilbert's mathematics is that they can be easily summarized from facts, but the proof is extremely hidden. -Gauss philosopher also wants to learn mathematics, because he must jump out of the vast phenomenon and grasp the real essence. ? And because it is a shortcut for the soul to transition to truth and eternity. -Plato Gauss (Prince of Mathematics) said, "Mathematics is the king of science". Russell said, "Mathematics is symbolic plus logic."