มาฟังคำพูด จากตระกูลนักคณิตศาสตร์กันบ้างดีกว่า
Bernoulli, Johann
But just as much as it is easy to find the differential of a given quantity, so it is difficult to find the integral of a given differential. Moreover, sometimes we cannot say with certainty whether the integral of a given quantity can be found or not.
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