Definition:Improper Integral/Half Open Interval/Open Below

Definition
Let $f$ be a real function which is continuous on the half open interval $\hointl a b$.

Then the improper integral of $f$ over $\hointl a b$ is defined as:


 * $\ds \int_{\mathop \to a}^b \map f t \rd t := \lim_{\gamma \mathop \to a} \int_\gamma^b \map f t \rd t$

Also denoted as
It is common to abuse notation and write:
 * $\ds \int_a^b \map f t \rd t$

which is understood to mean exactly the same thing as $\ds \int_{\mathop \to a}^b \map f t \rd t$.