\begin{definition}[Definition:Finite Measure/Signed Measure]
Let $\struct {X, \Sigma}$ be a measurable space.
Let $\mu$ be a signed measure on $\struct {X, \Sigma}$. 
We say that $\mu$ is a '''finite signed measure''' {{iff}}: 
:$\size {\map \mu X} < \infty$
\end{definition}