In mathematics, a content is a real function μ defined on a field of sets 
such that
![\mu(A)\in\ [0, \infty] \mbox{ whenever } A \in \mathcal{A}.](d/45d1408e44a91eb9ef50660934ed0652.png)
A very important type of content is a measure, which is a σ-additive content defined on a σ-field. Every measure is a content, but not vice-versa.
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