Definition:Improper Integral/Unbounded Open Interval/Unbounded Above

Definition
Let $f$ be a real function which is continuous on the unbounded open interval $\left({a \,.\,.\, +\infty}\right)$.

Then the improper integral of $f$ over $\left({a \,.\,.\, +\infty}\right)$ is defined as:


 * $\displaystyle \int_{\mathop \to a}^{\mathop \to +\infty} f \left({t}\right) \rd t := \lim_{\gamma \mathop \to a} \int_\gamma^c f \left({t}\right) \rd t + \lim_{\gamma \mathop \to +\infty} \int_c^\gamma f \left({t}\right) \rd t$

for some $c \in \left({a \,.\,.\, +\infty}\right)$.