To express \( 713 \) as a repeating decimal, we need to divide \( 713 \) by \( 999 \) to find its decimal representation.
Doing the division, we can see that: \[ 713 \div 999 = 0.713713713... \]
Since the digits "713" keep repeating, we can express this as: \[ 0.\overline{713} \]
So, the final answer is: \[ 0.\overline{713} \]