First of all, I want to tell you that famous detectives like Sherlock Holmes and Kudou Shinichi who never leave home do not exist in reality. Many modus operandi in novels and comics are almost impossible to realize in reality. In China, detective belongs to a low-level industry. The real job is nothing more than investigating marital infidelity and economic disputes, which also violates the crime of tort. Therefore, detective is a "gray profession", a profession between black and white. In foreign countries (especially in the west, Europe and America), detective is a glorious profession. They will help the police solve the case. If you really want to solve the case, I suggest you become a criminal policeman. In fact, with the current high-tech level and the "Skynet" system covered by the whole network, you don't need to think too much. Actually, the profession of detective is very simple. You must observe carefully and constantly restore events in your mind. The so-called reasoning is just to enlarge some details, connect them in series, and finally get speculation, and solve the whole case through certain evidence. You still ask here, does the detective have to do math? Then I'll tell you that detectives have nothing to do with mathematics. Although academic reasoning in mathematics and reasoning in detective case thinking are both called reasoning, they are completely different. If there is no connection between mathematics and detective, it is wrong in a certain sense. Learning math well is also helpful to your thinking ability. Detective is a very complicated thing. You must know a series of knowledge such as chemistry, physics and astronomy. If you don't have some knowledge, even if you can find the key clue, you can't reason because you don't know what this item can do. So, of course, you can be a detective if you don't learn math well, but it's better to learn well than not.