Improper integrals

This short lesson is intended to assist the ‘AS,’ and the ‘A,’ level students. The lesson explains in an easy to follow manner that
In mathematical analysis, an improper integral is the limit of a definite integral as an endpoint of the interval(s) of integration approaches either a specified real number, ∞ , − ∞ , or in some instances as both endpoints approach limits. Such an integral is often written symbolically just like a standard definite integral, in some cases with infinity as a limit of integration.