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)) divide(x0,x1) -> multiply(x0,inverse(x1)) multiply(inverse(x0),multiply(x0,x2)) -> x2 multiply(x0,inverse(x0)) -> identity() multiply(x0,identity()) -> x0 inverse(inverse(x1)) -> x1 multiply(x0,multiply(inverse(x0),x1)) -> x1 multiply(identity(),x0) -> x0 multiply(inverse(x0),x0) -> identity() inverse(identity()) -> identity() ) (COMMENT Termination is shown by KBO with weight w0 = 2 w(divide) = 1 w(identity) = 3 w(multiply) = 0 w(inverse) = 0 and precedence: inverse > multiply > divide > identity )