Let $M = (X, \mathcal{F}, \delta_{x_0})$ be a D5671: Point measure space such that

(i) | $f : X \to [-\infty, \infty]$ is an D1921: Absolutely integrable function on $M$ |

Then
\begin{equation}
\int_X f \, d \delta_{x_0}
= f(x_0)
\end{equation}