Qian Jilin is better at mathematical analysis. Qian Jilin's mathematical analysis covers a wide range, highlights key points and has many questions. Pei's mathematical analysis problem is old and covers a small area, so Qian Jilin's mathematical analysis is better. Mathematical analysis, also known as advanced calculus, is the oldest and most basic branch of analysis. Generally speaking, it refers to a relatively complete mathematical subject with the general theory of calculus and infinite series as the main content, including their theoretical basis (basic theory of real number, function and limit).