What is higher order infinitesimal? How to apply it in finding limit? Give an example
For example, 1 / n tends to be infinitesimal when n →∞
And 1 / N ^ 2 tends to be infinitesimal when n →∞
But 1 / N ^ 2 is much smaller than 1 / n
So 1 / N ^ 2 is infinitesimal of higher order than 1 / n
The main application in limit is that higher order infinitesimal can be obtained in molecule, and the result is 0