What are these functions called?

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Is there any name for the functions for which [tex]|f(x+y)| \leq |f(x)| + |f(y)|[/tex]?
 
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r4nd0m said:
Is there any name for the functions for which [tex]|f(x+y)| \leq |f(x)| + |f(y)|[/tex]?

Look up "subadditive".
 

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