I just like it. People can't understand it. I'm just not very clever, but that doesn't prevent me from enjoying math. In mathematics, everything is certain. Right and wrong will never be reversed, but it is not boring, magical and imaginative, and there will always be something beyond your thinking range for you to pursue. Life is too complicated, and it is too easy to reverse black and white. Find solace in mathematics, whether it is learning addition, subtraction, multiplication and division or Lagrange. When studying mathematics, you can feel that these are not utilitarian, but just moving towards the truth. And the more I like this kind of thing, the more I like it.