YES (VAR x0 x1 x2) (RULES multiply(multiply(x0,x1),x2) -> multiply(x0,multiply(x1,x2)) inverse(multiply(x1,x0)) -> multiply(inverse(x0),inverse(x1)) double_divide(x1,x0) -> multiply(inverse(x1),inverse(x0)) multiply(x0,inverse(x0)) -> identity() multiply(inverse(x1),multiply(x1,x0)) -> x0 multiply(x1,multiply(inverse(x1),x0)) -> x0 inverse(inverse(x0)) -> x0 multiply(x0,identity()) -> x0 inverse(identity()) -> 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 )