YES (VAR x1 x0 x2) (RULES multiply(multiply(x1,x0),x2) -> multiply(x1,multiply(x0,x2)) inverse(multiply(x1,x2)) -> multiply(inverse(x2),inverse(x1)) multiply(inverse(x0),multiply(x0,x1)) -> x1 multiply(x1,multiply(inverse(x1),x0)) -> x0 double_divide(x0,x1) -> multiply(inverse(x0),inverse(x1)) inverse(inverse(x0)) -> x0 multiply(x0,identity()) -> x0 inverse(identity()) -> identity() multiply(x1,inverse(x1)) -> identity() multiply(identity(),x0) -> x0 multiply(inverse(x0),x0) -> identity() ) (COMMENT Termination is shown by KBO with weight w0 = 1 w(double_divide) = 1 w(identity) = 1 w(multiply) = 0 w(inverse) = 0 and precedence: inverse > double_divide > multiply > identity )