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LaTeX Math Block
anchorRang
alignmentleft
\{ x \} = \{ x_1, x_2, x_3 ... x_n \} \rightarrow \{ rg(x) \} =

 \{ x_{i_1}, x_{i_2}, x_{i_3} ... x_{i_n} \}, \, {\rm where} \, x_{i_1} \leq x_{i_2} \leq x_{i_3} ...  \leq x_{i_n}

so that 

LaTeX Math Inline
bodyrg(x_k) = k