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Reference.org
Subadditive set function
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<p>In mathematics, a subadditive set function is a <a href="/facts/Set_function/Dy46B9EJ">set function</a> whose value, informally, has the property that the value of function on the union of two sets is at most the sum of values of the function on each of the sets. This is thematically related to the <a href="/facts/Subadditivity/jfRLRWfX">subadditivity</a> property of real-valued functions. </p>