相当于在一元微积分中，取一个函数的不定积分，仅仅需要在结果后加一个常数。
It is the same thing as, in one variable calculus, when you take the anti-derivative of a function it is only defined up to adding the constant.
认为中国古代数学家求解这类问题的基本思想方法是设法减少题目中未知元的个数，使不定解的问题转化为确定解的问题。
It points out that the main idea of ancient Chinese mathematicians for calculating such problems was to change an indeterminate problem into a determinate one.
分析了不定积分的四种基本求解方法：直接积分、第一换元法、第二换元法、分部积分法。
There are four solutions of indefinite integration in paper: direct integration, the first exchangeable integration, the second exchange - able integration, parcel integration.
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