Civilized Auction House: Start with the Multiplication Table

Liu Fan traveled to the wasteland world and found that the humans here were guarding the high-tech equipment left behind by the previous civilization, but even the multiplication table had become a lost secret. They can only press buttons but don't know the principles; they can drive a floating car but don't understand Newton's laws. After the rupture of civilization, knowledge has become the scarcest resource, and innovation has been obliterated by rules. Fortunately, he brought a mysterious auction house - what was auctioned here were not weapons and elixirs, but multiplication tables, periodic tables, and the Pythagorean theorem... Every time a piece of knowledge was sold, his level would be improved by one point. From the literacy level to the sentence reading level, from elementary school to doctorate, while others were still racking their brains on "two plus three equals five", Liu Fan had already put up his calculus lecture notes at the auction house. The big forces in the wasteland went crazy: "I will travel to ten cities to exchange for that secret book called 'Elementary School Mathematics'!" Liu Fan looked at the system panel and smiled without saying a word. His ultimate goal is to save enough points to exchange for a "time travel ticket" and return to his own world. But before that, he had to teach these wasteland monks what dimensionality reduction strikes meant.