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What are these functions called?

  1. Sep 24, 2007 #1
    Is there any name for the functions for which [tex]|f(x+y)| \leq |f(x)| + |f(y)|[/tex]?
     
  2. jcsd
  3. Sep 24, 2007 #2
    Look up "subadditive".
     
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