软件包：ries（2018.08.05-1） [debports]
find algebraic equations, given their solution
Given a number, ries searches for algebraic equations in one variable that have a solution (root) near that number. It avoids trivial or reducible solutions like ``x/x = 1''. If the input is an integer, ries can find an exact solution expressed in terms of single-digit integers.
The output gives progressively ``more complex'' equations that come progressively closer to matching the input number.