YES (VAR x0 x1 x2 a) (RULES multiply(multiply(x0,x1),x2) -> multiply(x0,multiply(x1,x2)) multiply(x0,multiply(inverse(x0),x1)) -> x1 inverse(multiply(x1,x0)) -> multiply(inverse(x0),inverse(x1)) inverse(inverse(x0)) -> x0 multiply(inverse(x0),multiply(x0,x1)) -> x1 multiply(a,inverse(a)) -> identity() divide(x0,x1) -> multiply(x0,inverse(x1)) multiply(x0,identity()) -> x0 multiply(identity(),x0) -> x0 multiply(inverse(x0),x0) -> identity() inverse(identity()) -> identity() ) (COMMENT Termination is shown by EKBO with interpretations on natural numbers divide_A(x1,x2) = x1 + x2 + 2 identity_A = 1 multiply_A(x1,x2) = x1 + x2 + 1 inverse_A(x1) = x1 identity#_A = 0 weights w0 = 1 w(divide) = 0 w(identity) = 1 w(multiply) = 0 w(inverse) = 0 and precedence: inverse > divide > multiply > identity )