1, different content: different content: Compared with the second edition, the fourth edition is more comprehensive in content, adding new chapters such as linear algebra, differential equations and binary calculus, and covering the main knowledge points of college liberal arts mathematics more comprehensively.

2. Different typesetting and design: Compared with the second edition, the fourth edition is more modern in typesetting and design, paying more attention to the beauty and readability of the layout, and designing and making some charts and formulas more carefully.