YES (VAR x0 x1 x2 a x3) (RULES multiply(multiply(x0,x1),x2) -> multiply(x0,multiply(x1,x2)) inverse(multiply(x1,x0)) -> multiply(inverse(x0),inverse(x1)) multiply(a,inverse(a)) -> identity() divide(x0,x1) -> multiply(x0,inverse(x1)) multiply(inverse(x0),multiply(x0,x1)) -> x1 multiply(inverse(x0),x0) -> identity() multiply(x0,identity()) -> x0 inverse(inverse(x3)) -> x3 multiply(identity(),x1) -> x1 multiply(x0,multiply(inverse(x0),x1)) -> x1 inverse(identity()) -> identity() ) (COMMENT Termination is shown by ELPO with interpretations on natural numbers divide_A(x1,x2) = x1 + x2 + 1 identity_A = 0 multiply_A(x1,x2) = x1 + x2 + 1 inverse_A(x1) = x1 divide#_A(x1,x2) = x2 identity#_A = 0 and precedence: divide > inverse > multiply > identity )