Learning mathematical analysis should start from two directions, one is the big analysis theory, and the other is advanced mathematics, which is simple and mainly based on calculation, and is basically the same as the mathematics content studied by engineering students. The big analysis theory mainly focuses on the mutual proof of six theorems in real number field. And the proof of related theorems in two-dimensional space. This part is the essence of mathematical analysis. When learning mathematical analysis, we should pay attention to the difference between mathematical analysis and advanced mathematics, so we must learn these places well, otherwise they are no different from advanced mathematics. Moreover, advanced mathematics emphasizes computing ability, and mathematical analysis emphasizes analytical ability. If you haven't studied analytical skills, your computing skills are not enough. So what's the use of learning math? I recommend a set of textbooks written by Liu Yulian to be used together with two books, and the effect is very good. Learning mathematical analysis needs drawing time, spend more time thinking, and can't always indulge yourself in doing problems. The question and answer part of each section should be carefully studied 2.

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