Isotonic function

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An order preserving function LaTeX: f: X \rightarrow \mathbb{R}^m, i.e. for any LaTeX: x and LaTeX: y in LaTeX: X

LaTeX: 
x > y \Rightarrow f(x) > f(y) \; \mbox{ and } \;
x < y \Rightarrow f(x) < f(y).


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