Abstract:
The paper discusses improper integral from angles of analyzing the aim of studying it, the problem that improper integral works on, the definition and convergence condition and theorems of improper integral. To remind people when learning it, it is more important to understand the necessity and inevitability that predecessors constructed the system of the knowledge, and the deep connection behind concepts and knowledge logically and inevitably than just remember concepts and related knowledge. Then it helps to enlarge thinking space and arise interest, and provides some reference to people interested in addition.
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