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Reference.org
Subadditivity
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, subadditivity is a property of a function that states, roughly, that evaluating the function for the sum of two <a href="/facts/Element_(set)/Q2mx1vHL">elements</a> of the <a href="/facts/Domain_of_a_function/FQvoeUpX">domain</a> always returns something less than or equal to the sum of the function's values at each element. There are numerous examples of subadditive functions in various areas of mathematics, particularly <a href="/facts/Norm_(mathematics)/xIbR4uE1">norms</a> and <a href="/facts/Square_roots/AfrzfBdQ">square roots</a>. <a href="/facts/Additive_map/lyCB3yy0">Additive maps</a> are special cases of subadditive functions. </p>