Definition:Variation/Signed Measure/Definition 1
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Definition
Let $\struct {X, \Sigma}$ be a measurable space.
Let $\mu$ be a signed measure on $\struct {X, \Sigma}$.
Let $\struct {\mu^+, \mu^-}$ be the Jordan decomposition of $\mu$.
We define the variation $\size \mu$ of $\mu$ by:
- $\size \mu = \mu^+ + \mu^-$
Sources
- 2013: Donald L. Cohn: Measure Theory (2nd ed.) ... (previous) ... (next): $4.1$: Signed and Complex Measures